This psychological thriller reminded me a lot of the old Hammer horror movies. A naive couple, an isolated island, nefarious hosts, a creeping sense of foreboding and growing sense of things not quite right... The ending got a little hysterical but that, too, seemed in keeping. Hugely enjoyable.
LabRat
Athos: If you'd told us what you were doing, we might have been able to plan this properly. Aramis: Yes, sorry. Athos: No, no, by all means, let's keep things suicidal.