Christian the Lion book by Anthony Bourke

As Ace and John, two friends, are searching for holiday gifts in London, they come across a lion cub for sale in Harrods, the famous department store! Unable to bear the thought of leaving the cub, Ace and John take him home and name him Christian. After a year of fun and mischief Christian has grown up, and Ace and John realize that their pet needs to be among other lions and deserves to live free, in his natural environment. Luckily, friends help introduce Christian to the African wild.

Christian the Lion tells the riveting true story of one animal’s ability to adapt to life in the wild, and captures the unexpectedly enduring connection between man and animal.