Often regarded as her most interesting book and set on New Zealand’s North Island, Ngaio Marsh herself considered this to be her best-written novel.

It was a horrible death – Maurice Questing was lured into a pool of boiling mud and left there to die.

Chief Inspector Roderick Alleyn, far from home on a wartime quest for German agents, knew that any number of people could have killed him: the English exiles he’d hated, the New Zealanders he’d despised or the Maoris he’d insulted. Even the spies he’d thwarted – if he wasn’t a spy himself…