Beckett finds herself in the Captain's chair while Castle makes the leap from author to full-blown Private Investigator. The season begins with a bang as a call from a mysterious stranger puts Beckett on the run and sets off an explosive chain of events. The action gets even more exciting, and a little crazy, when Castle's daughter, Alexis, joins her father to solve the case of a lifetime.

The wedding bells are ringing, but will Castle and Beckett really tie the knot? On the biggest day of his life, Castle is nowhere to be found, and it's not because he has cold feet. Castle and Beckett take on New York City's most fascinating cases while they try to solve the mystery of their own relationship.

After Castle's stunning romantic proposal to Beckett, what happens next? TV's magnetic crime-fighting couple faces a whole new set of challenges as they juggle wedding plans and their most intriguing cases yet in ABC's "Castle: The Complete Sixth Season". Beckett's new job with the Justice Department takes her away from the wisecracking love of her life. But Castle's devotion to his new fiancee - and her fascinating line of work - jeopardizes her...