When young girl Rosie Rinaldi (guest star Daisy Tahan) is kidnapped, the girl's mother, Liz Ranaldi (guest star Michelle Ray Smith) immediately points Detectives Olivia Benson (Mariska Hargitay) and Elliot Stabler (Christopher Meloni) in the direction of her ex-husband, Geno Parnell (guest star Ron Eldard), a recently paroled convict. When Parnell's alibi checks out, a fight erupts between Parker and Detectives Stabler and Odafin Tutola (Ice-T), which in turn unveils some knowledge on Parker's ex-wife. Parker admits Liz's father is Frank Hagar (guest star Dabney Coleman), a master thief with a lot of enemies. The detectives pay a visit to Hagar, but are surprised to find he has a severe case of Alzheimer's disease. With the help of Dr. George Huang (B.D. Wong), the detectives are able to put together a few clues to solve the case, but must pair up again with Parker in order to find Rosie.