The Lioness of Fire Desert (Night Zookeeper Paperback)

When Will steps through a mysterious portal at the zoo he's transported into the world of the Night Zoo, and thrust into an incredible adventure. 
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.