When young girl Rosie Rinaldi is kidnapped, the girl's mother, Liz Ranaldi immediately points Detectives Olivia Benson and Elliot Stabler in the direction of her ex-husband, Geno Parnell, a recently paroled convict. When Parnell's alibi checks out, a fight erupts between Parker and Detectives Stabler and Odafin Tutola, which in turn unveils some knowledge on Parker's ex-wife. Parker admits Liz's father is Frank Hagar, 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, 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.