Skarloey has lots of jobs and is very, very busy. Rheneas decides to help his friend and take Skarloey's coal cars for him as a surprise. He won't tell anyone what he's up to. But when Rheneas tries to puff up a steep hill with his and Skarloey's cars, they prove much too heavy. He leaves Skarloey's trucks in a siding while he delivers his first. When Rheneas returns, Skarloey's cars have vanished - Rheneas can't find them anywhere. He asks some other engines for help, but before they can start looking, Peter Sam appears, pulling the missing cars! He found them in the siding. Everyone is relieved that the cars have been found. Especially Rheneas who gets to deliver Skarloey's cars after all. Thomas is to take an important Admiral to open a new maritime museum. At the docks, Salty tells Thomas about the lost pirate treasure of Sodor, giving him the old clues to its whereabouts. With the Admiral on board, Thomas sets about trying to follow the clues. He becomes so distracted by his quest that he makes the Admiral very late. Sir Topham Hatt is cross and sends for Harold to take the Admiral the rest of the way. Thomas continues on his quest and finds the final clue, an old line. At the end of the line is the maritime museum, and the Admiral was about to open it. Thomas reveals the location of the lost treasure. The Admiral and Sir Topham Hatt are delighted. Thomas is pleased that he stuck to his quest!