The Diamond Brothers In South By South East (Anthony Horowitz)

Meet the Diamond Brothers, the world's most defective detectives, by the author of the number one bestselling Alex Rider series. Tim is broke. So when a mysterious stranger offers him a wad of money for his overcoat, it seems like a stroke of good fortune. But there are worse things than being broke. Being shot, for one – which is what happens to the stranger, and could soon be the fate of the Diamond Brothers…