The Intruder - 1975 - 4/10

Cheap (very cheap) looking variation on “And Then There Were None”.
A boatload of passengers arrives on a remote isle off Nassau.
Most are related to a deceased relative who supposedly left behind a hidden stash of gold bullion.
Once the yacht departs, once visitors start wondering about their situation – the dying starts.
Inept script. “Say, it’s a lovely night for a moonlight walk.” “Sure.” Next instant, lightning and lashing rain.
Or - when half the party are dead, everyone outdoors chasing, one female decides to take a bubble bath.
Conversations packed with pregnant pauses and reaction shots.
Within fifteen minutes, I knew who the killer was!
Three “name” actors in this, two snuffed early on, the third is a no-show until late.