A Sin to Err

Peggy Carter has a theory. The girl who cleaned out Howard Stark's vault was raised in Russia, one of a room full of young operatives who grew up chained to their beds. Peggy carries the idea to Chief Dooley, and the case against Stark finally begins to turn. Edwin Jarvis draws up the list Stark never wanted written: every woman he has entertained in six months. Peggy is not hunting for a face. She is hunting for scars on the wrist, the mark of a bed a child could not leave. The trail runs through a jeweler and a short column of Stark's conquests. It ends at a neighbor. Dottie Underwood, sweet as pie across the breakfast table at the Griffith, is the assassin Peggy has been chasing all along.

Down in a cell, Sheldon McFee hands Daniel Sousa the last piece: the blonde who once cuffed him to a chair. The SSR turns on one of its own. Meanwhile Dr. Ivchenko, the rescued psychiatrist the whole agency trusts, sits beside Agent Yauch and talks him gently toward a top-shelf bourbon and then toward his own death. Peggy runs. She doubles back to the Griffith for the one thing she will not leave behind, a vial of Steve Rogers' blood. Dottie is waiting with a kiss, and Peggy's own knockout lipstick drops her cold. Jack Thompson snaps on the cuffs. The best agent in the building is under arrest for treason, and the real spy strolls out the front door.