The Nice and the Good — Iris Murdoch

John Ducane, a respected Whitehall civil servant, is asked to investigate the suicide of a colleague. As he pursues his inquiry he uncovers a shabby, evil world of murder, blackmail, and black magic.

In contrast to stagnant summer London, Octavian and Kate Gray's adoring community on the Dorset coast seems to offer Ducane refuge, but even here the aftereffects of violence poison an atmosphere already electric with adolescent quarrels and intrigue. After a swim into the underworld, Ducane begins to realize that niceness is not enough, and no one here is good.