While investigating the murder of stockbroker Peter Forrest, Al and Carrie are forced to flee when a gas leak explosion destroys his warehouse apartment. Owing to her extraordinary memory, Carrie recalls details of the crime scene, including a box of files from Forrest’s firm that were being shredded before he was killed. After the initials “H.H.” – which Carrie recalls seeing on the boxes – fail to provide a solid lead, his co-workers reveal that Forrest was being threatened by Isaac Brezner, a disgruntled client who lost a fortune in the housing market. But when Brezner’s alibi checks out, Carrie and Al turn to Forrest’s widow, Allison, who, after claiming that she and her estranged husband were trying to reconcile, admits that Peter may have been seeing another woman. After a search of phone records identifies the other woman as Forrest’s co-worker Claire Hewson, whom security tapes place outside his apartment the day before he was killed, she’s found murdered, too.Recalling a logo she saw on a coffee mug in the dead woman’s apartment, Carrie realizes that the name on the file boxes was really “H to H,” a charity that rehabilitates ex-gang members and had hired Forrest to manage their funds. Upon finding that the charity’s bank account was recently closed, Carrie and Al head to a state prison to interview its founder, Pablo Hortua, and his associate, Ramon Garza. But after it’s found that Forrest transferred the money to a new bank just as the imprisoned gang members claimed, Nina and Mike track down Patrick Woodson, Claire’s ex-boyfriend and a Marine sergeant with a history of violence. However, after Woodson’s alibi clears him of suspicion, Carrie revisits her memories and sees Garza at the crime scene, too.As both Al and the D.A. question how an inmate could have been in New York City when Forrest was killed, Carrie heads back upstate to see prison guard Dennis Halsey. When Carrie remembers seeing him at Forrest’s apartment, too, Halsey admits to helping Ramon and Pablo run a drug cartel money-laundering scheme from prison after they kidnapped his seven-year-old daughter. And after Carrie’s memories of the H to H website provide a clue as to her whereabouts, the police move in to save Halsey’s daughter while a raid on the prison ends with the arrests of Pablo and Ramon. © 2011 Sony Pictures Television Inc. and CBS Studios Inc. All Rights Reserved.