David and Siri are a young Swedish couple living in London. They have been together since the last year of high school and convinced of the strength of their love, have defied the norm and settled down together early. But during a drunken night out they meet Camille, a French art student, and at an after party a flirtatious game occurs where the boundaries gradually dissolve. Giving in to unusual impulse, and drunken curiosity, they have a threesome. In the moment it feels exciting and completely unproblematic. But afterwards, the incident tears at Siri. A feeling that she and David have been irrevocably careless, and neglected something fundamental, takes over. Their relationship starts to show cracks, though both David and Siri do their utmost to keep it intact. Normalise. But the foundations are already rocked and Siri begins to question both their love and their choices in life.