In a quaint town along Spain's wealthy Costa del Sol, a band of professionals plan the robbery of a small bank managed by the respectable middle-aged Modesto (Antonio Resines). Using his wife as a hostage, the thieves him inside the bank vault while they make off with the valuables. Battered and dazed and waiting for rescue, Modesto stumbles on a safety deposit box that could hold the answers to the mysterious death of his daughter seven years earlier. his investigation leads him into an intricate web of corruption and foul play while his desire for vengeance provokes violent responses from the police and government officials determined to keep secrets buried. Box 507 is a gripping, unpredictable crime thriller full of intrigue and style in the best tradition of Chinatown and the works of Hitchcock.