Here's the synopsis for S2 Ep1 "The Lady in the Lake" In 1947 New York, Chief Jack Thompson and Agent Peggy Carter of the SSR apprehend Soviet spy Dottie Underwood, after setting her up during an attempted bank robbery. Newly appointed Chief Daniel Sousa of the Los Angeles SSR office meets with Detective Andrew Henry, who has discovered a woman's body in a frozen lake during a heat wave. Sousa, doubting his inexperienced subordinates, asks Thompson for backup—Carter is sent.
An autopsy shows that the body glows in the dark, likely caused by Isodyne Energy's particle accelerator. Carter learns from Isodyne scientist Jason Wilkes that the woman was a physicist there who had an affair with Isodyne owner and prospective senator Calvin Chadwick. Underwood is taken into FBI custody, with Thompson's mentor Vernon Masters warning him that the SSR will soon be replaced by a new, peace-time organization. Henry attempts to kill Wilkes, but is killed himself by a police officer; Henry and the officer were hired to cover up the murder by Chadwick and his actress wife Whitney Frost following the former's affair.
The frozen woman must have come into physical contact with it, though its effects are not limited to that. Carter and Wilkes agree to steal the Zero Matter, and at Isodyne find agents of the Council destroying the program. Wilkes manages to get to the Zero Matter, but is confronted by Frost, who is there to steal it herself. The two are exposed to the Zero Matter in the ensuing scuffle, leaving Wilkes missing and Frost having absorbed Zero Matter.