As Nick and Hank turn their attention to a string of attacks where victims are left without their memories, Nick weighs whether or not he should regain his Grimm abilities. Trubel joins the investigation and puts herself in harms way. ?In Vienna, Adalind is being held captive and learns that she is more connected than ever to Nick. Meanwhile, Captain Renard continues to fight for his life as a mysterious visitor arrives to help him.

Nick and Hank are called to an unusual crime scene with a victim who appears to have died from clay-induced asphyxiation. At the precinct, Wu begins to grow more suspicious of Trubel's presence. At the Spice Shop, Elizabeth makes a major breakthrough with regards to restoring Nick's powers, while Monroe and Rosalee experience cultural backlash as a result of their inter-Wesen marriage. In Europe, Adalind hopes that putting trust in her mysterious visitor will help her escape the dungeon.