Over 1000 people a year in the UK report seeing 'big cats', possibly pumas or panthers. Have these animals escaped from zoos? Are they the descendants of pets released into wild? Or is there another solution to the mystery? In this extraordinary book, big cat tracker Merrily Harpur interviews farmers, gamekeepers, ornithologists, policemen and even parents who have seen curious cats on the school run. In the process she discovers our mystery felines may have been with us for longer than we imagine, and draws some startling conclusions from what is now the commonest encounter with the unknown in Britain.