Tommy is an invisible attendant on the Cross-Atlantic Train Carriage- also know as the CAT Car. It was a train that ran across the Atlantic Ocean, making headlines before it was even built. He's only there for the money, but it seems he's not the only one. Suspicious guests aboard its first trip accidentally reveal secrets to their invisible attendant that he can't get out of his head. A detective, a thief, an actor, a billionaire, two minimum wage workers and their boss walk into a train carriage... And not all of them will walk out when the journey ends.