Simon (played by Jason Bateman) and Robyn (Rebecca Hall) are a happily married couple and have just moved, due to a promotion for Simon, to Los Angeles from Chicago. Simon bumps into someone he knew at school, 20 years ago - Gordon (Joel Edgerton). Gordon starts sending the couple gifts and starts dropping around their house unexpectedly. Initially they are happy to humour him but he is not really a friend of theirs and is a bit creepy, so they ask him to stay away from them. Gordon obliges but from his parting note Robyn thinks that there may be an incident in Simon and Gordon's schooldays that Simon doesn't want to talk about. So she starts investigating...—grantss