Lyudmilla Ignatenko, a Pripyat resident, ignores warning about her firefighter husband’s contamination. Valery Legasov lays out a decontamination plan, complete with human risks.

Barbara gets involved with a recently widowed pregnant woman, and Sister Monica Joan has her cataract surgery.

A grieving Max must face the consequences of his painful decision. Laura discovers she’s not being told everything at the Dryden Commission, while Joe uncovers Karen’s shocking secret.