: A man from Rosalee's past begins contacting her, causing her significant distress.

The partial title you're looking for is , which is the 8th episode of Season 5 of the TV series Grimm .

: Things turn deadly when Logan actually starts killing people, including a local business owner and a teenager, rather than just scaring them.

: Nick, Hank, and Trubel investigate the sightings. Trubel eventually goes undercover to trap Logan, leading to a showdown where both Logan and Wayne end up dead. Subplots

The story follows a "Lake Monster" legend at Diamond Lake that appears to come back to life after a tourist's mysterious death.

: Captain Renard is approached about supporting or potentially becoming a candidate for mayor as Black Claw begins its political infiltration. If you're interested, I can provide more details on: The Wasser Zahne Wesen species The Hadrian's Wall vs. Black Claw conflict What happens next in Rosalee’s storyline "Grimm" A Reptile Dysfunction (TV Episode 2016)