1993 movie written by Tess Gerritsen, directed by Christian Duguay, and starring Kate Jackson, Kenneth Welsh, Bruce Greenwood, Kelly Rowan.
Married couple Katie (Kate Jackson) and Guy (Kenneth Welsh) go sailing in the Pacific in an attempt to save their marriage. They come across a motionless boat which has a starving couple clinging to the remains, Nick (Bruce Greenwood) and Eliza (Kelly Rowan). Katie and Guy have no option but to let them board their own sailboat unaware that they happen to be rather dangerous. The peaceful waters quickly become an isolated prison as things quickly take a turn for the worse.