John Ellison Conlee

Diane settles in as a new partner at Reddick, Boseman and Kolstad. Maia deals with fallout from the financial scandal, but picks up a new case with Lucca.

The team hunts for a person who jeopardised a classified vaccine project, and Deeks must deal with his emotions as he returns to the field.

Michael returns to Kath but she and Colin begin to worry as the FBI fuels Michael's suspicions about their relationship. Elsewhere, Eileen is confined to bed rest for the duration of her pregnancy, and Tommy seeks Michael's assistance as Declan begins to focus his investigation on the Waterfront Project.

Tommy's plan to extricate himself from political entanglements hits a snag when Speaker Donatello seeks his help passing the budget. Declan learns more about Tommy's involvement in the Waterfront Project and connects Tommy to Nozzoli. Elsewhere, Michael's jealousy over his mother's attachment to Colin adds fuel to his paranoia about Colin and Kath.

When a fertility lab technician is murdered, details regarding her secret personal life are revealed -- leading to several possible suspects. Also, the tables are turned when Watson is investigated by an NYPD detective.

Chalky encounters Narcisse in Harlem, and federal agents enlist the help of Eli and Van Alden to take down the Capone organization. Nucky is pained by a recent loss, and in 1897, Nucky vents his frustration and roots out a young thief.