Goodbye, Portland. Hello, Germany.

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Nick (David Giuntoli) and Monroe (Silas Weir Mitchell) will ditch the Pacific Northwest for Germany during "Key Move," and the pair will still be rooting around the old country when the NBC drama moves into its 100th episode.

Titled "Into the Schwarzwald," the milestone episode will see one half of the Scooby Gang journey into the Black Forest in an effort to solve the Seven Key mystery once and for all. From the sound of it, the guys will "fall into a world of trouble."

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"Nick and Monroe find a treasure in Germany that has been hidden for centuries," NBC teased. "Back in Portland, Capt. Renard (Sasha Roiz) joins Hank (Russell Hornsby) and Wu (Reggie Lee) to track down a deadly assassin who has thrown Portland into havoc. Little do they know that Eve (Bitsie Tulloch) is on a hunt of her own for the same man."

"Into the Schwarzwald" will get a two-episode build up. Black Claw is wreaking havoc on Portland, but the Grimm's attention will be diverted when the Key Mystery comes back into the picture during "Map of the Seven Knights" (see a preview below). A major question mark in the Grimm landscape since day one, the cartographic puzzle will continue on in "Key Move" before reaching an alleged conclusion in "Into the Schwarzwald."

Catch Grimm Thursdays at 9 p.m. ET on NBC.

Tags: Grimm television nbc