Rob was sure his wife Fiona was ‘stepping out’ on him.
That’s why he followed her to the Lunar Lodge.
If she was in fact cheating on him, he had to see it for himself.
But instead of catching Fiona engaged in an extramarital rendezvous, Rob found her imprisoned in some secret, subterranean extension of the Lodge… along with the rest of the guests.
Rob’s first instinct is to free his captive wife… but perhaps there’s a good reason why Fiona is locked up in a room fitted with reinforced silver bars.