FBI Agent Angus Mariner is off-grid after a tragic car accident kills his beloved wife. Out of nowhere, he's approached by an eccentric old man, a billionaire, who gives him a $3M gift - and is discovered dead the next day. Mariner becomes a person of interest and later a suspect in the old man's death, as well as the death of a vagrant found on the beach a half mile from his residence. While investigating the dizzying turn of events, he is contacted...