Caution: spoilers ahead
It begins with the main character, John B (Chase Stokes) having a father who searched for the sunken treasure of the Royal Merchant – but he vanishes as he gets close to discovering the secret.
The ending reveals that John B didn’t just disappear. In fact, he was killed, as Ward Cameron and Sarah’s brother Rafe decide he knows too much about the treasure.
Topper saves the day by dressing up as John B as a distraction for the cops, but when a storm comes, escaping on the group’s boat will prove difficult.