No Stone Unturned: Rick and Marty Lagina begin their search for a centuries-old treasure vault in the Money Pit. (S4, ep 4)
Swamp Things: The Lagina brothers find evidence of what could be an ancient shipwreck in the Oak Island swamp. (S4, ep 3)
Always Forward: Rick and Marty Lagina investigate a mysterious 'Hatch' which may be a secret entrance to an underground treasure tunnel on Oak Island. (S4, ep 2)
Going for Broke: Rick and Marty Lagina return to Oak Island and begin preparations for a major excavation in the Money Pit. (S4, ep 1)
The Wrong Man: An innocent bystander falls victim to a drive-by. The intended target points police towards the shooter and his chauffeur; can detectives track them down? (S4, ep 49)
Fool For Love: A decomposed body in Dallas leads detectives to a trail of deceit, while in Memphis, a corpse dumped in a field leaves investigators scrambling for leads. (S4, ep 48)
Runaround: In Memphis, detectives struggle with witnesses who give dubious statements about a shooting, while in Phoenix, surveillance footage leads police to a killer. (S4, ep 46)
Pre-Emptive Strike/Unlucky: Dallas detectives find a decomposed body and are quickly drawn into a fast-paced manhunt to track down a mentally unstable suspect. (S4, ep 5)
The Witness/The Trunk: Miami detectives racing to solve the brutal murder of a husband and wife discover that their lead witness has a lot to lose. (S4, ep 4)
The Boogie Man: Dallas detectives investigating a murder uncover disturbing facts about the victim's dangerous lifestyle. (S4, ep 3)