The Black Book

Galip is an Istanbul lawyer, and his wife (as well as first cousin), Ruya, has vanished.

Could she be hiding out with her half brother (who also happens to be Galip's first cousin), Jelal, a newspaper columnist whose fame Galip envies? And if so, why isn't anyone in Jelal's flat? As Galip plays the part of private investigator, he assumes the identity of Jelal himself, wearing his clothes, answering his phone calls, even faking his wry columns, which he passes off as the work of the missing journalist.

But the amateur sleuth bungles his undercover operation, and with dire consequences.