Showrunners Norberto Barba and Jim Kouf teased that "Grimm" Season 5 100th episode milestone will focus on the keys. Also, NBC has released the official plot description of the 100th episode (episode 12) 'Into the Schwarzwald' and the recap of the previous episode 'Key Move' is provided here for fans who have missed to watch it.

Executive producers Norberto Barba and Jim Kouf teased that the100th episode milestone of "Grimm" will focus on the keys. The producers stated that the said episode will follow Nick Burkhardt (David Giuntoli) and Monroe (Silas Weir Mitchell) going on a trip to find where the keys are, where the keys fit, and discover some mindblowing things about what the keys have locked up eversince, International Business Times reports.

As for the official plot synopsis of episode 12, Spoilers Guide notes, "Nick and Monro find a treasure in Germany that has been hidden for centuries. Back in Portland, Captain Sean Renard (Sasha Roiz) joins Hank Griffin (Russel Hornsby) and Sergeant Wu (Reggie Lee) to track down a deady 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. Meanwhile, someone from Rosalee's (Bree Turner) past tracks her down."

For a quick recap of "Grimm" Season 5 previous episode 11 "Key Move", Christian Today reported that artifacts led Monroe and Nick closer to the mystery they've been searching for; Black Claw made a deadly move that could send Portland into chaos.

"Grimm" Season 5 Episode 12 which is also the show's 100th episode is entitled as "Into the Schwarzwald". The forthcoming episode is scheduled to premiere on Friday, March 11, 2016 at 9:00 p.m. exclusively on NBC.

'Grimm" is an American police procedural fantasy drama TV series created by Stephen Carpenter, David Greenwalt, and Jim Kouf.