Joined by his friends, Sam and Riya, Will journeys to Fire Desert, where rumours of a creature called 'the Grip' have struck fear into the hearts of the animals. Even Captain Claw, a fierce lioness, seems to be acting strangely on hearing the news.
Will, Sam and Riya travel to the Tusk Temple in search of Maji the time-travelling elephant. But the temple is in danger. The only way to save it is for Will to undergo the Night Zookeeper trial - facing leaps over bottomless caverns, impossible puzzles, and an ultimate test in bravery.
In this story, Will, Riya and Sam the Spying Giraffe must travel to a mountain flying high up in the sky! They are in search of a famous hero who can help protect the Night Zoo from the evil Lord of Nulth.
Our brave companions must climb a frozen waterfall, care for a hungry wolf, made entirely of a biting wind, and finally enter a dark ice cave. But, will our heroes find an ally or an enemy hiding within?