This episode opens with a full moon and a blonde little Red Riding Hood being chased in the woods. She screams as the screen fades to black. As the lighting is renewed, the viewers see Castle's mother writing her one-woman play. Castle is called to the scene of the crime shown at the beginning of the show.
Beckett uncovers that their victim was an attorney at a high power law firm and that she lived alone. She was also a Prada lover and the Red Riding Hood costume came from a retail shop. Interviews with the victim's family showed that the victim had cut off contact with them a week before she died. Castle, for once, offers a sane theory of adult role playing, though ruins the suggestion by stating how disappointed he is in himself.
Another officer announces that their victim had withdrawn over fifty thousand dollars from her savings account. The Medical Examiner revealed that while there was wolf hair on the body, the marks were made by a human killer. Also, the victim had been drugged.
A few hours after leaving the ME's office, Castle and Beckett are called to another park where another body was found—this time Snow White. Castle remarks about how the killer is following the Grimm fairy tales and the ME notes that both bodies had the same injection marks. The only difference was that their time of death was six hours apart.
The two victims had no connection with one another other than the fact that they both withdrew over fifty thousand dollars from their bank accounts and that the money was unaccounted for.
Back at Casa de Castle, Castle's mother is still working on her one-woman show while at the same time (according to Castle) rewriting his history by claiming she slept with the publisher of her son's first book. Castle makes his escape to the precinct.
After further digging, the address of the person who made the purchases of the costumes is uncovered. When no one answers the door, NYPD bursts in only to find an apartment filled with the creepiest dolls one could find. A random woman comes slowly walking in and tells them that there was no need to burst in.
After interviewing the creepy doll lady, Beckett and Castle find the address of their Sleeping Beauty and rush over. Thankfully, this one is still alive. She too had made a withdrawal of over fifty thousand dollars from her bank account. It is later uncovered that the three girls were being blackmailed.
After a little snooping, the team uncovers that it is the brother-in-law of the first victim who was doing the blackmailing. Apparently, his brother had been killed after attending a rave with the three victims. He admits to the blackmail but wouldn't admit to the murder.
While at his mother's show, Castle makes an important observation. The bows were tied differently on the third victim than on the other two—they had arrested the wrong man, or in this case the wrong woman.
Arriving at the suspect's hospital bed, Castle and Beckett began to question her gently but grow harder as the suspect ardently states that she had nothing to do with it. When the suspect tells Beckett to "prove it," which is basically an admission of guilt, Beckett lays their trump card down on the table and states that the suspects real-estate company filed a reverse mortgage on the apartment of creepy doll lady, which was how the suspect gained the credit card information.
Following the arrests, Castle and Beckett still find time to make it to Castle's mother's encore performance of her one-woman show.
