Save Alexis

SAVE ALEXIS: In a thrilling two-part event, Castle discovers the victim of a kidnapping plot is actually his own daughter, Alexis -- and is determined to get her back by any means necessary. 

Retweet @Castle_ABC's #SaveAlexis tweets to unlock the secrets of "Target" before it airs MONDAY FEB  18 at 10|9c, followed by  the stunning conclusion "Hunt," on MONDAY FEB 25 10|9c.