Photo Flash: First Look at CASTLE's 100th Episode, Airing 4/1

On CASTLE's upcoming episode, titled "The Lives of Others," in the show's 100th episode, Castle finds himself in the unfortunate position of NOT being able to work a case. While he's holed up in the loft with a broken leg, Beckett goes off to investigate the death of an IRS agent without him, leaving Castle miserable and bored. But when he thinks he witnesses the murder of a young woman in the apartment across the street, he is thrown into a "Rear Window"-esque murder mystery that hits much too close to home, on MONDAY, APRIL 1 (10:01-11:00 p.m., ET), on ABC.

Check out a first look below!

Photo by: ABC/Richard Cartwright

Susan Sullivan, Nathan Fillion

Susan Sullivan, Nathan Fillion, Stana Katic

Seamus Dever, Stana Katic, Jon Huertas

Seamus Dever, Nathan Fillion

Susan Sullivan, Nathan Fillion

Susan Sullivan, Nathan Fillion

Molly Quinn, Nathan Fillion

Nathan Fillion

Nathan Fillion