When a family's nanny is found gruesomely murdered, the obvious suspect is her Internet love interest, "Casanova". But it isn't long before Detectives Olivia Benson and Elliot Stabler suspect the nanny's employers may have a few dark skeletons in their closet. The investigation leads to a case of murder and infidelity, which is further complicated when Stabler's own family suffers a tragedy that leaves Stabler's unborn child in serious danger.