In a cab, Aidan Quinn is being rude to a talkative cab driver, while also throwing hundred dollar bills at him to keep him circling the block -- until Quinn's young daughter runs out into the middle of the street, in a white nightie covered in blood, with a phone, trying to call 911. Quinn finishes the call and finds his wife in their bloody bedroom, unconscious on the floor.

Fin is all surly with the crime scene detectives. You know, like when Elliot or Olivia ask, "Why call SVU?" Look, they'll get to it, guys. They always do. In this case, it's that the woman was raped.

Elliot and Olivia show up at the hospital, where a very chipper Katie (Quinn's daughter) doesn't seem to understand what's going on. Seeing Elliot look all grouchy, she gives him a hug. Kid, he always looks like that. You should see Cragen, for god's sake.

Back at the station, Katie's unnatural friendliness is completely wasted on Sgt. Munch, who growls at her and tells her she's not supposed to talk to strangers. Nice job teaching her that police officers aren't her friends but angry jerks, Munch. He's probably just crabby because he hasn't been on the show in a while. Little Katie has Williams syndrome, a rare form of mental retardation. Is that a real thing? Yep. Her elfin appearance is part of it, as is her over-comfort with strangers. As far as her witnessing the attack, it's hard to tell, with her limited attention span. Cragen suggests letting Aidan Quinn (whose name is Ben Nicholson here) help the police question her.

Katie says "They were yelling," and then she covers her ears as she remembers that it was too loud, and says she hid under the bed. "Then it was quiet. I heard footsteps. I went to find Mom. She was bleeding, so I took the phone, even though I'm not allowed to, because it was an emergency. Then Dad came home. He was gone a long time. The end." As for Dad, he's a project manager for a biochem company and is on the road a lot; he'd been gone for a couple of days, and was avoiding the usual spousal fights. By throwing hundreds at an annoying cabbie? That could have bought many drinks and/or records. Damn. The detectives also learn that he and his wife Corinne aren't too popular down at the group therapy session for parents of special needs children, since they have a wrongful birth suit against a popular high-risk obstetrician, who'd lose his insurance and close his practice if they win.