In the auto-fiction film L'enquête de mon cœur, French filmmaker Philippe Vallois wakes up to a strange reality: evidence and witnesses prove he spent the winter in a passionate romance with Bruno, a young Brazilian man. However, the director suffers from complete amnesia regarding the last three months. With Bruno already back in Brazil, Vallois launches a personal investigation to uncover his own forgotten story. Blending documentary and fiction, he attempts to piece together and virtually relive the romance using video footage from his camera, his personal journal, and the accounts of close friends.