Harry is born, lives his life and dies. Then he is born again, remembers his previous life, and goes mad and ultimately kills himself. Then he is born again a third time with two lifetime's worth of memories. Every time he is reborn it is at the same period in time in a largely identical timeline. It's possible, with some effort, to change things, but rarely for the best and when he dies it all resets again. The Chronos Club, consisting of people like him, frowns on that sort of behaviour. It's possible to pass messages up and down the timeline, and nobody want to mess with the lives of future members. But somebody is doing something big, something subtle and dangerous, gradually accelerating the end of the world in life after life. Harry may know who. Harry, filled with the ennui and helplessness of repetitive immortality, can track him down, but if he does will he stop the changes, or help them?

A terrific concept, well executed, that thinks through the consequences of its premise and creates a fully realised and fleshed out character to share them with us. Brilliantly written, evocative, scary, and a strange, intense and odd look at life and mortality and futility and friendship. Excellent.