Life is looking up for magazine crafts editor Anastasia Pollack.
Newly engaged, she and photojournalist fianc Zack Barnes are on a winter cruise with her family, compliments of a Christmas gift from her half-brother-in-law.
Son Alex's girlfriend and her father have also joined them.
Shortly after boarding the ship, Anastasia is approached by a man with an unusual interest in her engagement ring.
When she tells Zack of her encounter, he suggests the man might be a jewel thief scouting for his ne.