Lee Raven, boy thief, has stolen something he really didn't mean to. Now he faces a perilous flight through London (and the murky sewers below) as he tries to escape capture — because Lee has stolen the Book of Nebo, a book that has existed for thousands of years and tells every story and legend known to man. It's priceless. Some will even kill to possess it. The pressure mounts and the future of Nebo is in Lee's hands — can he prevent the most dangerous ending of them all?

Charlie Ashanti, the hero of LIONBOY, speaks cat — the language of all cats wild and domestic alike. His unusual talent helps him on his quest to find his kidnapped parents who have discovered a cure for asthma. The local cats of his home town (a futuristic London) start him on his search to solve the mystery of his missing parents, which leads him across the channel on board a circus ship bound for Paris. It is on this wonderful vessel that Charlie establishes a close relationship with the homesick circus lions who become his accomplices. But Charlie is in danger, for close behind him on his trail, is a crony of the mysterious group who have kidnapped his parents. They want Charlie too.

Charlie Ashanti is on the run from an amazing floating circus with six homesick beautiful Lions and an extraordinary sabre-toothed creature. Charlie has promised to help the Lions find their way home to Morocco but he has his own problems: his Mum and Dad have been kidnapped and he is determined to find them. His new friends, King Boris of Bulgaria and his security chief, Edward, have promised to help. But can Charlie and the Lions trust them? One thing is for sure, the chase is on …