Castle and Beckett look into the murder of a young mathematician gunned down with a 200-year-old bullet, sparking some wild theories by Castle about a time-travelling killer. When their investigation uncovers a tricked-out DeLorean and a suspect in Victorian clothing, is it possible Castle's crazy idea has some validity? This winding tale twists through the towers of Wall Street and into the world of a secret steampunk society that embraces the romance and simplicity of the past, while coupling it with the hope and promise of the future. Written by
Did You Know?
First appearance of Beckett's boyfriend Josh. See more
At the end when Castle opens the doors and asks "Just you?" and the angle changes to Alexis, camera microphone and top of the camera can be seen over the edge of the armchair. See more
A two hundred year old bullet can only mean one thing.
Time traveling killer.
References Back to the Future
Me and You, Watson
Performed by Alec Ounsworth See more