Cruise Director Beverley is having trouble keeping the entertainment team in line, but their onboard bickering is as nothing to what happens ashore when the ship docks in balmy Barcelona.

A murderer strikes in the shadow of the majestic Sagrada Familia cathedral, but who has the skills to kill in this very particular way – and what is their motive?

Crooner Jack and First Officer Kate uncover a mystery of concealed identities that stretches back to the assassination of a Russian oligarch.

Finally, at a moving musical tribute to a fallen friend, are Jack and Kate also saying goodbye to their chance of happiness together?

The holiday season is off to a rocky start when the ship's resident Santa falls ill, threatening to disappoint the passengers. Bev puts Jack in charge of finding a replacement Santa, and his search leads him to Buddy, a veteran comedian in Dubrovnik who seems like the perfect fit. However, unexpected events complicate Jack's plan, leaving everyone scrambling to save Christmas on board...

Meanwhile, Jamil sees the Santa situation as his big chance. Inspired by Jack and dreaming of a life on stage, he volunteers to play an elf, diving into the role with enthusiasm and giving it his all.

Jack sets himself a personal mission: to rekindle Kate's Christmas spirit and show her the magic of the festive season. As they spend more time together, their connection deepens, leaving everyone wondering if this Christmas will bring them closer together.

In the midst of the holiday excitement, there's a bit of tension between Kate and Piers as they navigate working together after their breakup. Piers faces a new career opportunity, prompting him to consider a big decision about his future.

Adding to the ship's changing dynamic, the new Head of Security, Frankie, steps into her role and quickly makes her presence known. Bev, too, is faced with an exciting new opportunity that could lead her to embark on a fresh chapter.