Simon and Robyn are a young married couple whose life seems just about perfect. They have recently relocated from Chicago to a Los Angeles suburb to start anew, following what appears to be Simon's promising career advancement. While out shopping for supplies for their new home, they encounter Gordo, an acquaintance from Simon's high school past. This chance meeting appears innocent at first. However, it soon becomes clear that Gordo is interested in rekindling a connection, persistently dropping by their house with unexpected gifts and showing an unsettling interest in their lives.

The couple’s initial amusement and curiosity about Gordo's intentions soon turn into unease as his gifts and visits become increasingly invasive, revealing the fragility of their relationship. Simon insists on cutting ties, seeing Gordo's behavior as nothing more than creepy and unwarranted. But Robyn becomes intrigued by Gordo's cryptic references to a shared history she knows nothing about. Her pursuit of the truth leads to unsettling discoveries about her husband's past, hinting at secrets Simon is desperate to keep buried. This quest for answers only deepens the wedge between her and Simon, exposing how little they may truly know about each other.