Dark Harbor (1998)

A bickering couple (Alan Rickman and Polly Walker) drive fast through a downpour to catch the last ferry to their island retreat. In a flash, they recognize a crumpled body laying at the side of the road after much argument they stop, only to find a young boy (Norman Reedus) battered and bruised. An offer of summoning the police firmly rejected, the two help the boy as best they can although it certainly means missing the ferry…and so starts this thriller: a tale of twisted sexual attraction and ulterior motives.