A famous mystery writer is found dead at the bottom of a dinghy, with both hands chopped off at the wrists. Superintendent Adam Dalgliesh, with help from his remarkable Aunt Jane, must discover who typed the writer's death sentence before the plot takes another murderous turn.

Unnatural Causes inspired Cosmopolitan to fervently hope, "if we're lucky, there will always be an England and there will always be a P. D. James."