Book 1

Spider Stampede

by Ali Sparkes

Published 1 January 2012
While seeking their lost dog, Piddle, twins Josh and Danny encounter their next-door neighbor, Petty Potts, a mad scientist whose SWITCH spray accidentally turns them into spiders.

While seeking their lost dog, Piddle, twins Josh and Danny encounter their next-door neighbor, Petty Potts, a mad scientist whose S.W.I.T.C.H. spray accidentally turns them into spiders. Book #1

Book 2

Fly Frenzy

by Ali Sparkes

Published 1 January 2013

Book 3

Grasshopper Glitch

by Ali Sparkes

Published 1 January 2013

Book 4

Ant Attack

by Ali Sparkes

Published 1 January 2013

Book 5

Crane Fly Crash

by Ali Sparkes

Published 7 April 2011
Josh and Danny must go on a rescue mission to save their annoying big sister, Jenny, when she accidentally uses the S.W.I.T.C.H spray on herself and turns into a crane fly!

The twins know there's only one thing for it - they'll have to change themselves into crane flies too, and try to keep their sister out of trouble.
However risky . . .

Can the boys resist the lure of the light bulb and stop Jenny from getting legless? And will Piddle the dog be able to resist a crunchy, bugtastic snack?

Petty Potts's diary entry:
Victor Crouch's spies could be anywhere! I keep imagining that old eyebrow-less freak staring through my windows . . .

But I suppose I do have to remember that sometimes I see and hear things which aren't really there. That's all part of the package when you're a genius. I will make sure Josh and Danny keep very watchful, though.

Ah ha! Ah ha ha ha ha! Erm. Scary powerful laugh etc. (It doesn't really work, typed out, does it?)

Book 6

Beetle Blast

by Ali Sparkes

Published 7 April 2011
Josh and Danny are on a day out with the local nature group, but when they accidentally eat a chocolate muffin laced with S.W.I.T.C.H formula, they experience the real dangers of pond life first hand. Soon the boys are beetling about in a pond, breathing underwater, and creating the most almighty stench to scare off predators.

But life as a pongy pond beetle is the least of their problems-there's a mysterious stranger hanging around-and he's out to get them.

Will Josh and Danny find out who the stranger is before it's too late? And can they help Petty Potts in her mission to recover all of the REPTOSWITCH cubes so she can turn them into even more exciting beasties?

Petty Potts's diary entry:
I do hope Josh and Danny will come round tomorrow-they have to understand the DANGER we're all in! And of course, I really need their help. I'm sure I will manage to talk them around. After all, they both can't wait to try out being a giant python or an alligator or a monitor lizard.

Book 7


Book 7

Frog Freakout

by Ali Sparkes

Published 1 January 2014
Twins Danny and Josh are having a miserable time at camp when mad scientist Petty Potts arrives, armed with her new AMPHISWITCH formula, just in time to get another camper out of trouble.

Book 8

Chameleon Chaos

by Ali Sparkes

Published 2 February 2012
Petty Potts' most recent reptoSWITCH spray doesn't seem to be working . . . not that Josh and Danny were all that excited about being chameleons anyway-alligators would be way better! Plus, they're distracted by the mystery of who is sending them clues to find marbles filled with scientific code.
But at school the next day, time seems to be going too fast for the twins, and when one of Danny's eyeballs rolls right round in its socket, they know things are getting weird. While Danny is distracted by the leafy coolness of his teacher's pot plant, Josh is causing a stir in PE, escaping the class bullies by climbing right up to the top of the gym ropes! How long will it be before the boys are boys again? And will they be able to find the next marble (and get their own back on those
bullies) in the meantime?

Book 8

Newt Nemesis

by Ali Sparkes

Published 1 January 2014
At summer camp, twins Josh and Danny and their new friend, Charlie, still have frog's legs from when "camp counselor" Petty Potts sprayed them with her new AMPHISWITCH, but a second attempt to restore them turns them into newts, instead.

Book 9

Turtle Terror

by Ali Sparkes

Published 2 February 2012
Josh and Danny are on holiday with their parents in Cornwall-so the last person they expect to see is mad scientist, and next door neighbour, Petty Potts! So when the twins see her on the beach - holding a turtle under each arm-they can't help but wonder what she's up to. The thing is, the boys have got other things on their mind. They've found another mystery marble clue, and need to get out to the ruined fort on the rocky island. But they take too long and the tide
comes in, trapping them. Luckily, they have a bottle filled with SWITCH spray and turn themselves into leatherback turtles! Their swim back to mainland is filled with danger . . . Will Danny be able to save Josh from the fishing net before he SWITCHes back in to a boy?

Book 9

Lizard Loopy

by Ali Sparkes

Published 2 February 2012
Petty's back with a new kind of SWITCH spray-reptoSWITCH! The lizard formula is ready for testing, and Josh and Danny are eager to help. But as Josh and Danny are trying it out in the safety of Petty's secret underground lab, they're interrupted by an intruder's attempt to get in to Petty's house! The intruder vanishes, but there is a package waiting for Josh and Danny at home containing a marble and a cryptic clue.
Will Josh and Danny find the next mysterious marble? And will they be able to work out who sent the clue, and why?

Book 12

Gecko Gladiator

by Ali Sparkes

Published 2 February 2012
Petty Potts has vanished-at least it seems that way to Josh and Danny. In actual fact, she's just relocated her secret lab . . . to the VERY pink and VERY girly Princess Land! Reluctantly, the twins fight their way through hordes of excited girls dressed as fairies to the back of the shop, where a single door stands between them and Petty's new lab. SWITCHing into geckos, the boys have no problems getting under the door and up the walls. It's on the way out that
things start to get really tricky . . . the SWITCH back hasn't gone well, and although Josh and Danny have normal legs, they're giant geckos from the waist up! How on earth will they escape from Princess Land now?!

Book 13

Anaconda Adventure

by Ali Sparkes

Published 5 April 2012
Josh and Danny have gone for a nice day out at the zoo. Or, should that be, a nice, experimental, day out at the zoo? Petty's developed a new SWITCH spray for snakes! And Josh and Danny are willing volunteers. Things start to go a bit wrong though when they fail to SWITCH back into boys, and are spotted by a whole class of girls on a school trip! Luckily, Charlie, an old friend from summer camp, is there to help, and the panic subsides. The trouble is not over yet
though . . .

Book 14

Alligator Action

by Ali Sparkes

Published 5 April 2012
Petty's been kidnapped! Josh and Danny have already broken into her secret lab looking for her, and now they're going to brave all her anti-intruder traps and break into her house. There's no sign of Petty, but there is a very interesting little box . . . containing the best SWITCH spray ever. Unable to resist the temptation, the twins head to the park to try out alligatorSWITCH spray. But before they make it to the river, they're roped into being in the audience of
a touring chat show, with some VERY interesting guests . . .

SWITCH:Spider Stampede

by Ali Sparkes

Published 3 February 2011
Josh and Danny have lost their dog, Piddle, and sneak next door to try and find him. They get more than they bargain for when they run into their next-door neighbour, Petty Potts - a mad scientist with a gleefully beastly serum. One accidental squirt of the S.W.I.T.C.H spray later and the twins find themselves with eight legs and the ability to shoot webbing out of their bums!

Josh and Danny are in big bug trouble as they face a dangerous journey across their back garden in the hope that Petty can SWITCH them back. But it's a big bad world out there and the brothers are no longer top of the food chain.

Petty Potts's diary entry:
I think it's high time I had some assistance on the SWITCH PROJECT . . . If only I could remember what happened to the rest of my research! I know I put the code for SWITCHing creatures to reptiles in the crystal cubes, as I did for the bugs and insects formula . . . and I know I hid the cubes somewhere safe from even me! I just can't remember. Victor Crouch has a lot to answer for. I will get my revenge on him. For burning out chunks of my memory and trying to steal my life's work.

SWITCH:Ant Attack

by Ali Sparkes

Published 3 February 2011
Josh and Danny know that their day is going to be a nightmare when their mum invites Tarquin round from next door. But they have no idea exactly how deadly the day will become until they are accidentally turned into ants. Where's Petty Potts - their friend and mad scientist - when the twins need her to SWITCH them back?

Armed with his magnifying glass, Tarquin can't wait to roast some insects. Danny and Josh may each have six legs but will they be able to get away in time?

Petty Potts's diary entry:
I have to warn Josh and Danny about the spies. I don't think they believed me. I might have to show them some evidence of my life before, when I worked with Victor Crouch in the government's secret underground labs. And I should probably show them his photograph. They need to be on their guard now.

They may only be children, but that wouldn't stop Victor if he ever found out what they knew. That wouldn't stop him at all . . .

SWITCH:Grasshopper Glitch

by Ali Sparkes

Published 3 February 2011
Josh and Danny let Petty Potts-their barmy next-door neighbour and scientist extraordinaire-give them a lift to school, but after a mix up with their drink and some S.W.I.T.C.H spray the twins suddenly have green feelers, ears in their abdomens and a strange ability to chuck up brown goo.

The boys must SWITCH back before anyone notices they're not in class. But school is the least of their worries-they're just a whisker away from trouble-there's a grasshopper muncher on the loose . . .

Petty Potts's diary entry:
One day, I am going to find Victor Crouch-confront him-and make him confess that he stole my work and burnt out my memory.

But in the meantime, as far as Josh and Danny are concerned, I will keep my promise and will never make them try any more spray or potion. Or trick them. Or bribe them. Or anything like that. Probably.