The 100th episode of “Castle,” appropriately titled “The Lives of Others,” puts Rick Castle right into the middle of a “Rear Window”-style mystery. While recovering from an injury, the bored writer takes to spying. But what he sees may be deadly.

In this video, Castle (Nathan Fillion) gets a good look at the neighbors across the street. What first appears to be nothing but a passionate tryst soon gets more complicated. Castle, watching through his binoculars, sees a young woman about to head to bed with a man in a fedora.

Things are not, however, what they seem. Just before anything really good can happen, another man walks into the apartment. It seems that the young lady has been doing a little bit of messing around with Fedora Guy. Initially, this is kept secret from her man — until he finds the fedora on the floor.

Later on, because Castle apparently has absolutely nothing better to do with his time than spy on the neighbors, a fight is brewing. Man and woman are preparing dinner when the arguing begins. While Castle eagerly anticipates a fight, he isn’t expecting the young man to bring a knife along with him.

This is of course the first time anything happens behind closed blinds.

Did Castle witness a murder? Will Beckett believe him? Is there any chance of Castle being spotted by a young man with blood on his hands?

We will find out when “The Lives of Others” airs on Monday, April 1 at 10pm on ABC.

Posted by:Laurel Brown