'Grimm' season 6 episode 6 spoilers: Renard continues to be haunted by his past; Nick and the others search for mysterious Wesen

Nick (David Giuntoli) and his friends must stop a mysterious Wesen from terrorizing the local residents on the upcoming episode of NBC's supernatural drama "Grimm" season 6.

Titled "Breakfast in Bed," this week's episode will see the group search for a Wesen who turns sleepless nights into pure madness. According to the official synopsis, Nick, Hank (Russell Hornsby), and Wu (Reggie Lee) head to a local hotel to investigate a grisly murder. While seeking statements from people in the area, a hotel guest claims to be haunted by a terrifying creature in the night.

Meanwhile, at the Spice Shop, Monroe (Silas Weir Mitchell), Rosalee (Bree Turner), and Eve (Bitsie Tulloch) are still looking for information about the origins of the cloth's symbols as they get close to unlocking its mysterious story. Capt. Renard (Sasha Roiz), on the other hand, feels restless as he continues to be haunted by his past wrongdoings.

The Wesen killer in last week's episode was a huge cicada insect that takes a human form to hunt down its prey. The creature climbs out of the ground once every seven years and has one day to eat, hence the title "The Seven Year Itch." Aside from being a Dionysian party animal, the monster turned out to be none other than Portland founding father William Stillman.

The hour also saw Rosalee and Monroe go to the doctor after Diana mentioned that she's carrying more than one baby. After the test, it was revealed that Rosalee was, in fact, pregnant with triplets.

Meanwhile, Diana sensed that Eve is trapped below Nick's loft, so they finally rescued her from her tunnel tomb. She told Nick that she was trapped and couldn't move her body to get out of the tomb. When Diana went down to see the carvings, the symbols glowed purple.

The sixth and final season of "Grimm" airs every Friday night at 8 p.m. ET on NBC.