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While investigating the mysterious shooting death of a young woman, Castle and Beckett face a cop's worst nightmare when they discover that the gun used in the killing is Det. Ryan's old service weapon - the one that was stolen by the serial killer, 3XK. Now with the clock ticking, the team must work to solve the murder, track down 3XK and retrieve Ryan's gun before the killer strikes again.
The scene opens with a construction crew pouring cement when suddenly a woman’s body is pulled out. Beckett and Castle arrive at the crime scene and Lanie says that she is going to have to chisel through the concrete before she can do the autopsy. The rounds from the gun are found and it appears to be a 9mm. They find the woman’s ID and it belongs to Jane Herzfeld. She was a college student. They get to the station and Esposito tells Ryan that Jane was an only child and that she was a tutor to other students. However, she cancelled on her students to do something important. Beckett and Castle see Lanie and she says that she found bruising and also had cocaine residue on her. Jane knew the killer. Jane’s mother comes in and Castle asks if Jane was into something else. Beckett says that there were drugs on Jane and says that there could have been people who would have been doing drugs. She tells them that Jane had a boyfriend she didn’t like. Ryan pulls up “Fin” McQueen, the boyfriend of Jane. He has a cocaine charge on his file and Beckett says that that would explain the residue that they found on Jane. ..Read the full recap