The 1970's death of a man killed by cyanide poisoning is reopened. Meanwhile, Scotty Valens is told some upsetting news and decided come back to work.
A programmer of sects victims is accused of murdered, so the sister of a teenager that committed suicide in 1978, treated by the same man, asks Lilly and the team for help: she now suspects that her brother could be murdered then, too. Besides, Valens receive bad news.—FefiB