While Humphrey investigates Frank's murder in the UK, in Saint Marie JP and Selwyn learn that Tom was smuggling rum. A memory card found by the pair reveals that Steve Thomas is Tom's son. Humphrey questions Steve, who is now the prime suspect in the... (more) murder investigation, but he then learns that two other suspects were determined to prevent Frank from signing an investment deal. Humphrey manages to eliminate Steve from the investigation, and when he uncovers a hidden family link, he solves the case with Jack. After solving the mystery, Humphrey decides he is happier back living in London with Martha. Jack agrees to fly out to Saint Marie for a holiday with his daughter to replace Humphrey for a few weeks.