Beckett and Castle purchase a storage unit in hopes of clues to a murdered woman they found.
Clues reveal that the victim’s twin brother was killed weeks before.
The brother was involved in a robbery at a rich woman’s house, where he stole the butler’s spare eye. The DNA on the eye proved that the butler was responsible for the death of their parents years before in a car crash.
The sister went to NY to find out the information, where she was killed by the butler as well.
Alexis moves into her dorm room.
Both Alexis and Martha know about Castle and Beckett’s relationship.