Lisa B. Tharps

Aidan pushes for a wedding date; Charlotte spices up her routine.

As Reid's investigation of a young boy's murder in Las Vegas continues, he discovers possible connections to his own past.

Reese and Finch attempts to rescue the Machine's source code before it deteriorates beyond repair. Root fights for her life against an onslaught of Samaritan's agents and Fusco is faced with hard questions following the deaths of Dominic and Elias.

Sherlock and his father attempt to repair their relationship upon learning of a death within their family; Holmes and Watson search for a killer who tried to mummify his victim.

Detectives Benson and Stabler believe a fellow cop may be behind murders going back 30 years; Munch is in rare form during a child molestation case.

Benson and Stabler believe a pedophile (John Dossett) may be behind the murder of a travel writer, especially after meeting the victim's landlady and her streetwise daughter (Patricia Richardson, Lynn Collins).