Castle Castle

It's going to be a rough couple of episodes for Rick Castle.

First Look: Castle finds his father... but loses his daughter?

On Monday's episode of Castle (10/9c, ABC), the first of a two-parter, the mystery writer-turned-NYPD consultant will be challenged like never before. After a mysterious hit-and-run murder leads Castle (

Nathan Fillion) and Beckett (Stana Katic) to uncover the kidnapping of a wealthy young heiress, Castle realizes his daughter Alexis (Molly Quinn) has also been taken. What is Alexis' connection to the case? And what do the kidnappers want? Those are both questions Castle can't answer alone. Enter FBI Agent Harris (guest star Dylan Walsh), an even-keeled investigator who helps Castle and Beckett in their search for the kidnappers.

Castle Scoop: Who's playing Rick's father?

In our exclusive first look at the episode, Castle and Beckett meet Agent Harris for the first time — before Castle even knows Alexis is mixed up in this mess. Do you think he'll be able to take Harris' advice to heart once he learns the truth?

Watch the sneak peek below. Castle airs Mondays at 10/9c on ABC.