
Gone
Doug Waverly and Nick Pratt are charged with rape and murder in the disappearance of Canadian student Jennifer Durning after Nick's cousin, Jason King, claims that while he had consensual sex with her that night the other two raped her. A stray pubic hair leads Novak to Keith Willis, a drunk who was paid off by the boys to get Jennifer out of the hotel and who later saw the boys kidnap her, but Willis exactly fit to be a witness as his mind has gone after years of alcohol abuse. Jason King disappears. Although they are able to find a bug in Donnelly's office, they are not able to prove that it was placed there by Pratt or Waverly. Judge Donnelly is forced to dismiss the case against the two boys since there is no case without Jason's testimony.
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S7 E1
Demons
Twenty years after being convicted of the rape of a teenage girl, Ray Schenkel is released, much to the dismay of retired detective William Dorsey. When a teenage girl is raped on the route Schenkel would have taken home, Stabler goes undercover as a recently paroled sex offender so that he can get into the same therapy group as Schenkel, and the same halfway house. Cragen worries that Stabler may be getting in over his head.

S7 E2
Design (I)
Benson saves April Troost from committing suicide, but feels responsible when Troost dies during the trial of the man she accuses of raping her and getting her pregnant. It isn't long before detectives learn that Barclay Pallister wasn't the only man April picked up in a bar who has no recollection of sleeping with her, and the squad realizes that Troost was no victim. Their search takes them from prospective parents looking to adopt her child to the men she drugged and accosted to the sperm center she used to work at, which ends up at the center of the case. This crossover continues on Law & Order S16E02 Flaw (II).

S7 E3
911
Benson is on her way out for the evening when a call comes in from a little girl who says she's all alone. While trying to draw the girl out, Benson is drawn deeper into the little girl's life, and although the other officers begin to suspect the whole thing may be some sick joke, Benson is convinced that the little girl is the real deal. By talking to Maria, Benson is able to ferret enough information from her so that they have a place to start, but Maria's captor has an affinity for electronics and has done everything he can to make sure that no one can find the little girl he bought and paid for.

S7 E4
Ripped
When the teenage son of Stabler's old partner comes under suspicion for attacking a classmate, Stabler's inability to treat this like any other case gets him suspended.