Liz infiltrates the blacksite and disarms the signal jammers to call in backup but runs into trouble along the way. The fate of Ressler hangs in the balance as Red tries to bargain with Anslo Garrick. Meanwhile, Tom becomes increasingly worried about Liz’ situation and the fate of Red is unknown.

Red informs the team that "The Alchemist" - a man who relies upon science to transform a person’s DNA - has been contracted to protect a well-known mob informant and his wife. As the team goes undercover to catch him, Liz finds herself on the hunt for an unlikely couple. Meanwhile Liz and Tom find themselves at another bump in their relationship and Ressler debates whether or not he should give his ex-girlfriend his blessing.

One of Red's former associates, a crime lord, becomes the next target; Tom decides to confront Jolene.