Beckett (Stana Katic) is on the hunt to solve the case of her mother's murder on an upcoming episode of Castle, but it will go horribly wrong.

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Beckett will be leading a secret investigation into her mother's murder on an upcoming episode of Castle titled Veritas. In Veritas, the 22nd episode of season 6, she discovers that a man she had been surveilling is killed.

Things grow worse for Beckett as there is new evidence that connects her to the victim, and both she and Castle (Nathan Fillion) find themselves as new targets in a manhunt that could put their lives in "grave danger," per ABC's plot synopsis.

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Guest stars in the episode include Alex Fernandez as Capt. Marcus Donovan, David Gautreaux as Dr. Oliver Pressing, Tom Billett as Sergio and Chic Daniel as Thomas. The episode is set to air Monday, May 5 at 10 p.m. on ABC.

In other Castle spoiler news, the impending wedding of Castle and Beckett is drawing closer and E! Online has a new report with more details on what lies ahead for the couple.

Monday night's episode of Castle, which is titled That '70s Show, features Martha figuring out flowers for the big day. However, her ideas for flower arrangements are less than desirable, including one with a portrait of Castle and Beckett made entirely of flowers. Neither Castle nor Beckett are on board with Martha's unique suggestions.

Castle season 6 airs Mondays at 10 p.m. on ABC.

Watch a promo for the next episode of Castle here:

Tags: Castle television ABC