Josh Flunk and Spencer Topps are just two normal schoolboys until the ivory skull on the old walking stick in Josh's bedroom flashes. Using a secret trapdoor under Josh's bed, they pass through the ancient Egyptian sarcophagus discovered by Josh's Great-great-great-Grandfather to become their alter egos, Zac Zoltan and his assistant Dr Brains, Masters of Zac Zotlan's Detective Agency - ready to save the world from marauding monsters. Book 1: Return of the Chocoholic Vampires: between the Stone Age and the Iron Age was the Chocolate Age, an age which came to an abrupt and mysterious end. When the remains of an ancient chocolate settlement are discovered, a precious chocolate amulet is unearthed and with it come the evil CHOCOLATE VAMPIRES. Book 2: Night of the Living Bed: more gruesome adventures to follow in July.

Everything is quiet at the Mad Monster Agency - too quiet. All over town people are increasingly tired. At first they feel drowsy, then chronically lethargic and eventually they can hardly move. The Agency bunker seems to be immune to whatever is causing the mass tiredness, so Zac and Dr Brains decide to spend the evening there. When they emerge on to the street at midnight they can't believe what they are seeing. People are being carried away in their beds! Following the procession of beds Zac and the Doctor find themselves deep underground where the victims are put to work digging but for what, and by whom? It's none other than the dreaded Hypno-Dwarves. Hypno-Dwarves are not the cuddly, bearded types. These cave dwellers have been around for centuries, honing their hypnotising skills over the course of time. Their new ruler, known simply as 'The Eye', wants much more. He is searching for the mythical jewel know as 'The Lion's Claw'. This stone gives those that possess it the power to hypnotise on a huge scale - if the Hypno-Dwarves find it the whole world will fall under their spell!