The Widow's Cruise

The Widow's Cruise is a 1959 British detective novel by Cecil Day-Lewis, written under the pen name of Nicholas Blake. It is the thirteenth in a series of novels featuring the private detective Nigel Strangeways.

Synopsis
Strangeways and his friend the sculptress arrange to go on a cruise ship visiting the Greek Islands. Soon they become aware of the underlying tensions between their fellow passengers, before a murder is committed.