Stabler and Beck track down a serial rapist who repeatedly attacks his victims based on their ovulation cycles so that he can impregnate them.
When an assailant rapes his victim twice, Detectives Stabler and Beck link the case to victims of multiple rapes. Based on the timeline of those subsequent attacks, Dr. George Huang suspects the rapist has one disturbing motive for these crimes. Tensions flare between the detectives as they make a difficult decision to help bring in the dangerous perp.—Alex