Nick and Hank investigate a string of brutal murders committed by an escaped felon seeking revenge against those who put him in jail. After the felon kills a judge, a prosecutor, and a jury head, Hank realizes the killer is a man by the name of Stark, a contract killer whose case Hank worked. Hank is suspended from the case for safety. The suspect seems to be incredibley strong which leads Nick to investigate from the Grimm point of view. After being attacked himself by the Stark at his home and going to the hospital, Monroe visits him and Nick learns that the suspect is a Siegbarste, an ogre-like creature. Monroe tells Nick that only "Siegbarste Gift", a deadly poison to the creature, will be enough to kill him. Since Nick is incapacitated, Monroe is forced to go to the trailer and retrieve the poison along with an elephant gun used for killing Siegbarstes. Hank goes to the hospital and tells Nick that he helped hide evidence that could have given doubt as to Stark's guilt. Hank leaves the hospital and is followed by Stark to an abandoned warehouse district. They are followed by Monroe. When they arrive Stark attacks Hank and Monroe shoots Stark with the elephant gun and poison laced bullets, killing him.