In the small Californian town of Molena Point, a crime unheard of for this quiet place occurred - the murder of a person. There were no two-legged witnesses to the crime nearby, so the criminal managed to escape, but the four-legged witness noticed and remembered everything... Meet Gray Joe, an extraordinary cat with ordinary human intelligence, a keen sense of justice and an amazing feline ability to sniff out everything and track everyone down. People have no idea about his intelligence, and Gray Joe is in no hurry to reveal himself: he is quite happy with his cat's life. It is enough that he, with his friend the cat Dulcie, who is also on his own, solves the most mysterious crimes that lead people to a dead end.