Ryan and Esposito can’t believe their colleague let a woman he used to have “ex sex” with stay at his place. Beckett learns Meredith used to spike Castle’s coffee with nutmeg to help him get through some all night writing sessions. She also learns that her boyfriend’s ex wants to have dinner with her. Alone. Castle drives himself crazy wondering what these two ladies talking about. Beckett ends up having a great time with Meredith. She also lets Castle off the hook as far as being mad at him. Their makeup make-out session is interrupted by a break in the case.

Satellite photos show there were two boats in the area the night Leann Piper disappeared. One belonged to Billy Piper while the other was registered to Walter Voss, who actually has no real motive for murder. Mr. Voss did, however, make a call to the forensic accountant, Rob Garrison. Castle notices that Billy Piper’s dead wife is actually a dead ringer for Garrison’s wife, Jane. That’s because they are the same person. Leann/Jane killed Michelle when she was going to expose the secret life she’s been leading. Case closed.

Beckett is able to return to her apartment. Meredith is heading off to Paris. The two ladies share a private goodbye chat. Beckett asks Meredith why things didn’t work out with her and Castle. The answer she gets is a tad unsettling. Meredith realized that her ex knew everything about her, but she knew nothing about him. For example, Castle always clams up when asked how he felt about never having known his father. That was a long time ago. Meredith says Castle is a totally different man now. The concerned look on Beckett’s face suggests that she may not believe that to be true.