Plot

When a Lothario is killed, Castle and Beckett suspect that the victim's mysterious double life holds the key to his murder. Their investigation leads to a shocking twist that threatens to disrupt Ryan's wedding with Jenny.

A naked man plunges to his death in a fruit stand. However, investigation determines he wasn't forced out the window. He had actually been poisoned a few hours earlier. He turns out to be a serial seducer, who mysteriously deviated from his usual MO to pick up higher class, and even married, women. While Ryan is doing a liquid cleansing diet with Jenny before their wedding, Castle comes up with alternative, business-related motives and suspects in addition to the many scorned women.—KGF Vissers

Michael Bailey was a talented pickup artist, who had seduced hundreds of women and had about a dozen long-term lovers. Moments after his last one night stand, Michael collapsed. His autopsy revealed that he had been poisoned with an overdose of medicine. Beckett's investigation soon reveals that Michael's life had taken a strange turn in its last month. Michael had started using an alias, he had taken an extended leave from his job, he took efforts to avoid both his two best friends and his long-term lovers, and he never visited his own apartment. Beckett and her team eventually realize that Michael had been hired as a corporate spy. He was using his seduction talents on women involved in an ongoing corporate merger, in order to get access to their secrets. Now the investigators have to find out who Michael was working for, and who had the motive and the opportunity to poison him.—Dimos I