Street cat named Bob

In this story, two main characters are James Bowen, a street London musician, and Red Bob, Street London Cat. They were homeless and lonely, but once met each other ...
James died of drugs and despair, there was no sense in his life until a four-legged friend appeared in it, who helped him cope with problems, brought luck and became a real guardian angel.
Now Bob and James (namely in this sequence!) are well known not only by the inhabitants of London, who meet them on the streets, in the subway and cafes, but also hundreds of thousands of people around the world. YouTube videos, photos on Facebook, posts on Twitter, and now the book written by James Bowen tells an amazing story about friendship with the cat that changed his life