A baby is found abandoned outside of a children's gym, and Benson and Stabler are charged with figuring out the baby's identity. The baby (Jasper) is the adopted son of a well-to-do woman, Dede Aston. The baby's nanny, Imelda, is in tears when the detectives speak with her, worrying over the empty crib. A neighbor, Wade, claims that he heard screams coming from the apartment the night the baby went missing. A used condom is found in the trash and the nanny confesses that while Dede was away on a business trip, Imelda invited her boyfriend, prominent attorney Ken Turner, over.
Dede arrives at the precinct to get her baby back, and Ken shows up as well. It turns out that Dede and Ken are engaged, and it was Ken's idea for Dede to adopt the baby. He knew a pregnant woman who was a drug addict, and arranged for Dede to take custody of the child because she'd be able to offer him a better life.
Imelda claims that Ken doesn't love Dede and he promised her that he'd leave Dede as soon as he gets the chance. Imelda and Dede have an explosive argument, with Dede accusing Imelda of abandoning the baby. When asked where she went on her business trip, Dede confesses that she never left town that night. She was staying at a hotel.
Dede then blows up at Ken for sleeping with Imelda and then tells Ken that she's pregnant. Ken is excited because now there will be a new sibling for baby Jasper, and even if the condom broke, having a baby is a blessed event. Benson notices that Ken's condoms break rather often and that he might be a reproductive abuser. He has an undeniable urge to father children and will stop at nothing to get what he wants. Benson points out that Ken pokes holes in his condoms, which is typical reproductive abuser behavior. However, Dede is too in love with Ken to listen to Benson's warning.
Wade, the neighbor, admits to kidnapping Jasper and placing him outside the children's gym. He believed that the baby was in a terrible environment and hoped that one of the other families who frequent the gym would take him in instead. Dede is relieved to hear the truth behind the baby's kidnapping, but Benson tells her that Ken has fathered over twenty children, and in fact, he's also Jasper's father.
The detectives bring in Dr. Audrey Shelton to help with the case. She is an expert in reproductive abusers and provides insight into what goes on in Ken's mind when he tries to seduce women into bearing his children. Benson goes to talk to Bridget, Jasper's mom. Bridget is a drug addict, but it's clear that she regrets giving her son up for adoption and says that Ken pretty much forced her to. Audrey realizes that they can bring Ken in for facilitating an illegal adoption, without the mother's consent.
Ken is brought in, but he doesn't seem to understand that what he did is wrong. Audrey says that she's never seen a worse case of reproductive abuse as with Ken. However, Ken is released from custody on a technicality. Benson confronts him with all the women who carried his children, along with all the children. Ken is still unapologetic, claiming that he loves them. Later, Ken is found dead outside Dede's home.
The detectives see that Wade (the neighbor) is getting ready to leave town. Wade says that he found Ken's body but he didn't kill him. A wasp injection knife, which could have been used in the murder, is found in Wade's home. Wade says that he's not the only person who has the same type of knife. In fact, Dede has the same type of knife.
There was a meeting of Ken's partners and children and Audrey was the only one missing. It turns out that Audrey had murdered Ken, as punishment for his misdeeds.