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After a passenger is murdered, the hunt for the truth leads deep into a web of deceit and desperation. And with Jack drawn back in by the mystery, will he also rekindle his romance with Kate?

The ship docks in Cannes, where a rising star is murdered at a film premiere.

After a murder takes place onboard during a presentation by a renowned wellness guru, Jack is on the case - and the prime suspect is a disgruntled patient.

A photographer, hoping to recapture the magic of his former years by recreating an iconic photograph of his long-lost muse, is found murdered. Jack and Kate are on the case.

Two widows embark on a grief cruise to celebrate the lives of their departed loved ones. But after the pair visit a shrine, one is found murdered. Jack and Kate are on the case.

In Malta, one of a pair of brothers is murdered during a scavenger hunt. Back on the ship, Kate is forced to take control of the bridge as Marlowe potentially puts the ship in serious peril.

After a nightclub owner's slimy business associate is murdered - by being pushed off the venue's balcony - Jack and Kate get on the case. Meanwhile, the pair reach a new understanding.

The ship docks in Ancona, Italy. Piers is in great spirits, and arranges to meet Sharon for some food, their romance blossoming beautifully. But first he must entertain two old naval college friends, Jens and Antoine.