3 A M (1975)

Storyline:

3 A M 1975 Mark and Elaine have two teenage kids, Ronnie and Stacey And then there is Kate, Elaines sister, whos been having an affair with Mark for fifteen years she tells us in the opening voiceover While living under the same roof, no less She also tells us in that same voiceover that shes had some less than pure relations with Stacey over the years, but thats neither here nor there Mark and Elaine are finished going at it, two things happen first, he informs Elaine he taped them having sex Second, he tells her hes leaving her Brilliant Kate rushes down to the boat, hoping they can go away together When Mark refuses and wants to go alone, she hits him in the head with a champagne bottle, sending him overboard When he doesnt surface, she decides to cover up the murder The only problem is, the sexy new next door neighbor, Vickie, saw someone else on the boat with Mark that night though it was too dark to see who it was