On Monday night, Castle and Beckett are called in to investigate the death of an Irish mobster.

However, our second-favorite crime-fighting duo (sorry, but there's only one Bones and Booth) uncovers a pair of unexpected developments along the way:

1. They may be on to an international drug smuggling operation.
2. They also think the killer was involved in the murder of Beckett's mom.

Click on the photos below for an early look at a few scenes from "Sucker Punch."

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.