When Fred and Harry are called away to a conference, the pair are convinced that they will have a few days of rest with not even Siren being able to cause havoc for them. But before they can leave, Fred has to check in on his brother, Ryan. Rather than delay Harry's departure and keep him from the women that the detective intends to seduce, Fred drops him at the train station.

But nothing is ever simple for any of the troubled trio, not even taking a train No sooner than Harry finds an empty seat on the train, he discovers that the seat next to him is already occupied by the private investigator with a fetish for black leathers. With Siren on the train, Harry knows that the journey is going to be far from smooth, but when the train is hijacked by Derek Long, things are even more complicated than before.

Can Harry and Siren survive this latest run in with the so-called legitimate business man? Will Fred be able to help from the outside? Or is this the end of a beautiful friendship?