Happily (2021)

Tom and Janet have been happily married for years. But a visit from a mysterious stranger leads to a dead body, a lot of questions, and a tense couples’ trip with friends who may not actually be friends at all.

Happily is the kind of movie that is just daring you to guess where everything is going - only you will never ever get it right. - Sean Mulvihill, Fanboynation.com