The Lake of Darkness
Ruth Rendell
 Martin Urban is a young accountant leading the comfortable though somewhat dull life of a bachelor. Unexpectedly he wins a very large sum of money in a football pool (104,754 pounds 46 pence), but he decides to give half the money away to the poor. Then Francesca enters into his life, a mysterious young woman who captures his heart. And when he meets Finn, the twisted son of his mother's cleaning lady, the good intentions of Martin become fatally entangled with the macabre madness of Finn, with deadly results. nl:The Lake of Darkness