Lionboy by Zizou Corder
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.