Lisa B. Tharps

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.

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.

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

A pimp puts Sipowicz on his hit list for roughing up an associate; John Clark's name is found in a murdered prostitute's appointment book.