It's an 'all in the family' voyage when Millie’s step-daughter, Fiona, joins Siren of the Seas to see her father.

The last time Millie saw Fiona was when she stormed out of the restaurant during a celebratory dinner after calling Millie some terrible names.

To up Millie's anxiety, Andy is taking a vacation to visit his family. He changes his mind at the last minute and decides to bring his sister on board instead.

Disaster strikes when Scout goes missing and it's a race against time as Millie tries to find the family's pup before Fiona, who gifted Scout to her father, finds out.

Will Millie and her friends be able to find Scout or is the beloved family dog gone forever?