On the surface Kate and Jack, in their late 20s, are happy. But like everyone, they carry secrets that neither is prepared to reveal.
After their wedding they awake from a deep, dark sleep, each alone in a sealed room with no doors or windows - only images projected on the walls and a monitor with two buttons: one for "yes", one for "no".
As the horror of their situation unfolds, surveillance films showing their life together appear on the wall as the monitor asks questions, each more strange and terrifying than the last.
It soon becomes apparent that a bizarre test of their relationship is under way, and the secrets revealed lead them deeper and deeper into what could not just destroy their love, but threaten their very lives...