The long anticipated, epic cruise adventure is finally here! Two worlds collide when Gloria and the Garden Girls meet up with Gloria's cousin, Assistant Cruise Director, Millie Sanders and her crew aboard the passenger cruise ship, "Siren of the Seas."
Almost immediately, suspicions are raised when a group of mysterious passengers board and then head straight to the bridge for a private meeting with the captain. Not long after, Andy Walker, Millie's boss, tells her the ship will have some "temporary" staff boarding for this cruise, something that has never happened before.
Later, after the ship sets sail, Millie stops by to greet the captain and Scout, and sparks fly when the captain invites Millie to dine with him in his apartment the following evening. When Millie arrives for her dinner date the next night, she discovers the bridge is locked and no one will answer the door.
At first, Millie is heartbroken, believing she has been stood up, but soon discovers that something sinister is going on inside the bridge after communications onboard are cut off and the ship stops moving.
Will Millie and her friends, with some help from Gloria and the Garden Girls, be able to figure out who has taken control of their cruise...or will they all become dead in the water?