When you watch Grimm Season 5 Episode 12 online, Nick and Monroe dust themselves off after falling into the long-lost catacombs. Now they face more puzzles as they move one step closer to finding the long-hidden mystery treasure left behind by the Seven Grimm Crusaders centuries ago. But they don't know that they're already being hunted by a group of Wesen desperate to keep whatever it is out of their hands. Back in Portland, Rosalee faces her troubled past in Seattle when her stalker shows up in person demanding money, and Adalind endures a painful epiphany of her own. Meanwhile, Eve and Hadrian's Wall work to take advantage of the presence of Black Claw's assassin, in the hopes that the assassin will lead them back to the Black Claw leadership. But the lack of communication between Hadrian's Wall and Team Grimm just might prove to be a major stumbling block, as Captain Renard, Hank, and Wu are also hunting the assassin. Who will catch the assassin? What will happen when Rosalee faces her stalker? What exactly is the that long-lost Grimm treasure, anyway? Find out when you watch Grimm Season 5 Episode 12 online!