Lisa B. Tharps

Dr Reid investigates a decades-old murder that happened in Las Vegas that he thinks is connected to his own childhood.

Reese and Finch try to save the Machine's source code before it deteriorates; Root struggles to survive an onslaught of Samaritan's agents; Fusco faces tough questions following the deaths of Dominic and Elias.

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

Carrie gets cold feet as Aidan pushes for a wedding date, Charlotte takes up tap dancing, Miranda struggles to be a typical expectant mum, and Samantha asks Richard to be monogamous.

When a young African-American woman is found murdered with a plastic bag over her head, the suspects include a policeman who is prone to violence and an affluent white boyfriend.

Benson and Stabler believe a paedophile may be behind the murder of a travel writer, especially after meeting the victim's landlady and her streetwise daughter.