One day, Edward Blue's engine has boiler problems while he is leaving with a freight train, and then he disappears without a trace. BoCo and Bill find him and it turns out that someone killed him. James notices this and investigates to find whoever is responsible for the death of Edward and his other friends. And joining his Team are: Thomas, Henry, Gordon, James, Percy, Toby, Duck, Donald, Douglas, Oliver, Emily, Rosie and Molly.