The Lake of Darkness - Ruth Rendell

Martin Urban has always led a comfortable and safe life. Until he wins £100,000 in the pools and decides to use some of his new-found wealth to help out those less fortunate than himself.

Finn lives a dangerous life and he too comes into some money. But his came in cash, wrapped in newspaper. Finn is also interested in helping people – as long as the price is right.

If all had remained as it had been, the path of Martin and the path of Finn would never have crossed. But Martin’s money – which he hopes to use to change the lives of strangers – changes his own life as well. And so it is that the good intentions of the one become fatally entangled with the macabre madness of the other.