Scott searches for a missing friend in Mexico in the Season 4 premiere.
A suspect in NCIS' murder investigation of two former military contractors puts one of the team in serious peril. Callen gets set up on a blind date.
Still grieving for his brother, Al, in a fit of rage kills a policeman. Rothstein and Margaret unexpectedly run in to each other, and Willie drops out of college, enraging his father.
Nucky reaches out to Joe Masseria after the battle with Rosetti. Gillian takes action to gain custody of her grandson. Eli's oldest son asks Nucky for career advice.
Mike Warren, newly commissioned FBI agent, gets his first assignment living with 3 other agents from the FBI, DEA and US Customs.
As Capone's cavalry rides in, the war starts: with firepower on the one hand and scheming to alienate Masseria from Rosetti, Nucky fights to get his business back and keep his life. Gillian takes on Gyp with her very own weapons, but sees herself overpowered; Richard poses as a one-man-army and seems to have more luck saving what's important. Meanwhile, Margaret has run off to face difficult decisions – not only about her unborn baby, but also about the future of her marriage.
Owen makes plans with Katie as well as with Margaret, but those will turn out a whole different way after Nucky sends him to take care of Joe. Nucky too makes promises to his wife, speaking of a better future while trying to sort out his current business situation – being troubled with this, he turns down Chalky, one of his few allies left. On the political side, Gaston takes further action.
Meanwhile, Gyp has to deal with the uncertainties of nature, and Nelson "George Muller" Van Alden with the nature of uncertain dealings.
Gyp bribes the townspeople into silence while Nucky schemes to have him taken out of the picture for good. Gillian has words with James regarding Tommy.
Eli invites Nucky to Easter dinner in the hope of mending a few fences.
Nucky and Owen end up trapped and hiding in a house from the feds after tracking down a thief who has been stealing from them.
A life strategist, along with the FBI, is enlisted to help Major Crimes to solve the murder of a man who was preparing to testify against the Israeli mob. Provenza, who is in a vulnerable state, displays rare emotion with the strategist and Rusty has a bad day at school.moreless
Tony and Ziva travel to Colombia, where they are joined by Ziva's longtime mentor in the search for a missing Marine Lieutenant and Navy Chaplain.
House and his team treat an Alzheimer's patient who flies into violent rages and throws up blood. Meanwhile, Wilson copies with a patient who claims that there is no sexual relationship in her marriage.moreless
The team looks into the reason for the assassination of a judge while Jo tries to come to peace with why she left the FBI.
Nucky asks the Attorney General for a favor when the Commodore stops alcohol reaching Atlantic City.
A body found down a manhole leads to the lonely life of a Czech immigrant recently fired from her job for getting too close to her employer's son. Meanwhile, on the eve of launching Nikki Heat, Castle's agent has an exciting new offer for him; but if he takes it, it would end his work with Beckett.moreless