Steve Punt returns as Radio 4's very own gumshoe, examining the mysterious case of millionaire financier Alfred Loewenstein who fell out of his own aeroplane in 1928.

The suspicious death of this fabulously wealthy Belgian tycoon - then reportedly the world's third richest man - may well be Punt's most baffling investigation yet.

During that fateful flight across the English Channel, Loewenstein got up to go the loo - but somehow ended up falling out of the plane. What exactly happened to him remains a mystery to this day.

Was it just an accident, did Loewenstein jump - or was it murder? Punt reopens the case.

Producer: Laurence Grissell.