After a recent daring escape attempt, Zak Nine and his Quom friend Erro are imprisoned in the most inescapable region of Alcatraz. The boys are locked in separate cages, hovering at the end of unbreakable chains over a boiling sea of poison. How will the boys escape their latest dilemma? Even if they break out of their cells, how will they travel across the venomous waters to safety? It's the most perilous adventure yet as the boys try to escape from Planet Alcatraz.

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

Hoping to avoid the Alcatraz guards, Zak Nine and Erro decide to climb down into a deep canyon to hide. But soon the boys see some huge rock formations that move! Zak and Erro are quickly caught by the giant criminals that have been imprisoned in the deep gorge. Some of the giants want to hand the boys over to the Alcatraz guards to gain their own freedom. But a few giants would rather turn the boys into dinner! Will Zak and Erro outwit their captors and get away before becoming the giants' next meal?

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

During their last adventure, Zak Nine and Erro found a mapping device in a crashed prison ship. Following the map, the boys make their way to the Plateau of Leng, a vast desert on Planet Alcatraz. Other than an occasional giant scorpion, the boys seem to be safe on the endless sands until they spring a deadly trap! Huge rocky walls spring up from beneath the sand, grinding against each other and forming into walls, passageways and stone cages. Will the boys be fast enough to avoid getting trapped forever on this hot, desert plain?

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

Zak Nine and his Quom friend, Erro, are desperate to get off planet Alcatraz. The boys believe they've finally found a way to freedom when they join up with another prisoner. Together with their new partner, the boys board a small spacecraft and fly off the planet, past the metal moon, and head into space. But when the stars begin to look strange, Zak and Erro realize that something is very wrong. What will happen when the boys learn Planet Alcatraz's biggest secret? Will they ever be able to return home?

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

Erro and Zak Nine are hiding in the Phantom Forest, a dark wood filled with giant, towering trees and dangerous beasts. The boys hide high above the ground, climbing and jumping between the tree branches. So far they've avoided dangerous creatures such as huge, hairy rats and giant, bloodthirsty spiders. But a new predator has caught the boys' scent. An enormous flying serpent chases after them and won't stop until its hunger is satisfied! How will Zak and Erro avoid becoming dinner for this deadly new monster?

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

Zak Nine and his friend Erro are on the run! While avoiding a band of patrolling prison guards, the boys meet another escapee who tells them the legend of an abandoned spacecraft. The boys believe that if they can find the ancient ship, they'll be able to fix it and blast off from Planet Alcatraz. But first, they must cross the Igneous Quag, an uncharted swamp full of flame-spitting snakes and hidden geysers of fatal fire!

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

Zak Nine and Erro have come up with a brilliant plan to escape. They'll simply hide on board a prison ship and ride it to freedom on another planet! Unfortunately, the boys don't get far when the ship docks at one of Planet Alcatraz's metallic moons. The hollow sphere is magnetic, and the only way to walk on it is by wearing special magnetic boots. The boys are soon discovered and are forced to flee. But how will they escape when they're stuck floating inside a giant metal ball?

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

Zak Nine has been captured and placed in Planet Alcatraz's "Monster Zoo". But this isn't any ordinary zoo. This zoo holds dozens of alien "monsters" who are forced to fight for the entertainment of the prison planet's owners. Zak's friend, Erro, is determined to break into the zoo to rescue the human boy. Erro will need to rely on his Quom survival skills to succeed. Will he be able to find Zak, avoid the zoo's Overseers and find a way out?

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

Travelling by night, Zak Nine and Erro are following a shadowy figure until the mysterious stranger disappears into a cave. The boys decide to follow. Inside they find a maze filled with priceless gems, along with a rough band of escaped criminals. Things go from bad to worse when a squad of Alcatraz guards arrives on the scene. When the guards start shooting their laser blasters, suddenly nobody is safe! Will Zak and Erro escape the deadly storm of laser fire, or will they be trapped in the endless dark forever?

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

Zak Nine and Erro have escaped! But now they find themselves lost in a vast forest of alien birds and deadly plants. Things get even worse when they hear strange buzzing sounds just above the treetops attack drones! The prison guards are searching for the boys using a flock of remote bots, armed with flame-throwers and sleeping gas. Will the boys outwit the bots and find a way off Planet Alcatraz? The exotic flora and fauna just might provide a solution to the high-tech hazards hunting our heroes.

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

As Zak Nine and his friend Erro make their way around a strange lake, they discover an ancient golden building. The boys decide to go inside to take a closer look, but unwittingly stumble into the legendary Octagon: an underground chamber with eight mysterious doors. One door will lead the boys to freedom, but the rest lead to sinister traps and certain death! Will Zak and Erro outwit the deadly room and escape before it's too late?

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.

Young Quom Erro and his human friend Zak Nine are in trouble. They're stuck in Planet Alcatraz's most infamous jail cell: a huge metal cylinder that's sunk into the ground but open to the sky. The boys are certain they can climb out, but they quickly discover the cunning secret of the pit. When they make too many movements, the floor sinks and the pit grows even deeper. Will the boys manage to climb out or will their hopes dwindle as the circle of sky overhead shrinks to a distant dot?

This special Express edition has a reduced level text of ATOS 2.0 or lower. With exciting illustrations and gripping, page-turning text, it is sure to engross even the most reluctant of readers.