Derrick O'Connor

Monk and Natalie go to police headquarters to ask Captain Stottlemeyer for a raise. While they are there, Lieutenant Disher brings in Warren Landis, a security guard from a local museum, for questioning. The world-famous Alexander diamond has been stolen from the museum, and the police are interrogating all museum employees. When Monk notices some chemical residue on Landis' fingers, Disher arrests the security guard on drug charges. When Natalie hears that there's a million dollar reward for the diamond, she convinces Monk to use his detective skills to try to find the stolen gem.

Stroud hits the road on his mission, making rapid progress. Ben seeks out a former associate of Scudder's named Father Kerrigan, a disturbed artist whose 'vision' Ben has seen before. Justin and Iris welcome a beautiful new 'servant' into their home. Meanwhile, Samson threatens to replace Stumpy, who works Rita Sue and Libby harder than ever; Sofie seeks comfort in manual labor, to the men's chagrin; Lila challenges Samson's easy dismissal of Lodz; Management confides in Ben about a secret fear; and Justin makes late-night visits to Chinatown, where a mysterious woman helps manifest his destiny--in the flesh.

While in London, Jessica (Angela Lansbury) becomes involved in a murder cover-up by the British Intelligence Agency when she happens upon a disappearing corpse. Guest stars: Lloyd Bochner, Nick Tate.

The Department of Special Research inquires about Sydney's connection to the Rambaldi notebook.

Sydney finds herself face-to-face with her mother. Will's life changes after he finds about SD-6 and Sydney's other life, and Dixon is unsure if he should tell Sloane about Sydney's suspicious behavior.