Lisa B. Tharps

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.

Samantha's relationship with Richard has her considering monogamy, although he may not be feeling the same way. Carrie, on the other hand, is forced to face her fear of commitment.

Dr. Reid embarks on his own investigation into the murderr of a young boy years earlier in Las Vegas that he strongly believes has a connection to his own childhood. Jane Lynch ("Two and a Half Men") guest stars as Dr. Reid's mother, Diana Reid.

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.

President Dalton's mental status is questioned when he threatens Russia over its potential role in a sonic attack at the U.S. embassy in Bulgaria.

The team investigates the 1991 murder of a 14-year-old foster child who was starting to establish herself as a talented rapper.