Sean O'Brien Books in Order

After his wife's death, former Miami detective Sean O'Brien retreats to the St. Johns River. A dying young woman pulls him into a brutal case involving trafficking, old guilt, and a promise he cannot walk away from.

A priest learns that a man set to die in 84 hours may be innocent. Sean O'Brien races to reopen the case, follow a clue tied to Omega, and stop the real killer before time runs out.

Graduate student Molly Monroe sees something violent in the Ocala National Forest and becomes prey. Sean O'Brien enters a wilderness of greed, hidden treasure, and old brutality to keep her alive.

Sean O'Brien's discovery of a buried German U-boat reopens a World War II killing once dismissed as a mugging. The trail leads to a family's long grief and a secret linked to the Manhattan Project.

Courtney Burke is tied to a string of carnival murders, but Sean O'Brien suspects the truth began decades earlier. To save her, he has to unravel family secrets, religious corruption, and a crime hidden in plain sight.

Hired to find a Civil War painting, Sean O'Brien stumbles into murder, a hidden map, and a secret letter. What begins as a search for family honor grows into a dangerous hunt through buried American history.

A dead man's letter and a sister's fifty-year search send Sean O'Brien to a notorious Florida reform school. The deeper he digs, the closer he gets to a truth powerful people still want buried.

When Joe Billie is accused after a grave robber turns up dead, Sean O'Brien knows his friend is hiding something. The case takes him through the Everglades and into a lethal mix of greed, history, and vengeance.

A killer is hunting retired CIA agents, and Sean O'Brien's old friend Dave Collins may be next. The clues point to a sailboat called Dragonfly and a vendetta that refuses to stay in the past.

A simple stop to buy flowers drops Sean O'Brien into a case involving a botanist, rare ghost orchids, and deadly corruption. Deep in the Everglades, greed and politics turn a fragile ecosystem into a battleground.

When a young woman in a mermaid tail washes ashore, police call it an accident. Sean O'Brien sees a pattern, and when a friend's daughter may be next, the case turns urgent and personal.

A diver is murdered after a legendary Spanish galleon is found off Florida, and Sean's friend Nick Cronus is framed. Treasure fever brings out killers, and Sean becomes the last obstacle between them and billions.

Sean O'Brien briefly helps a young girl in traffic, then sees her face on the news after she disappears. To find her alive, he must enter the dark web and face a ruthless network that sells human lives.

A former Delta Force friend asks Sean O'Brien to investigate his son's sudden death. The search reveals a chain of suspicious deaths and pulls Sean into an underworld where getting answers may cost him everything.