Grimm keeps up its frantic pace in "Love Sick" as it moves towards the season finale, and not since “Last Grimm Standing” has the show been this exciting.

The key, and Adalind, the parts of the puzzle that have been hanging around outside the fringes of the series since the very beginning have finally begun to work their way in to the picture. When Aunt Marie gave Nick the key, she told him to guard it with his life, and its covering hides a map. What that map is, exactly? No idea, but Burow is a town in Northern Germany.

Since so much of Grimm has been steeped in a history we’ve never really watched unfold yet, and one of the biggest reasons why so many of the Wesen act the way they do is because of lineage and family I’m beginning to wonder if the key is like a literal key to Nick’s past. If someone were to gain access to it then all of the Grimms secrets could be revealed, and if the theory that Renard and his royal family are the ones who like things to stay status quo, then they certainly don’t want someone like Nick getting in the way of how they conduct their business.

In other words, if Renard and the royal family can get their hands on the Grimms and how they conduct their business, then they are one step closer to stamping out their adversaries. That’s my theory at least.

Hank continues to hold up his title as the most boring character, and his infatuation with Adalind, while out of his control, made him boring and annoying. Grimm left us with a cliffhanger on whether or not Team Nick told him after he woke up. However, no matter how boring he ultimately is, I do admire how devoted Nick is to their partnership (and vice-versa). Nick had no problems threating and being physical with Adalind during their double date to instill fear into her. Even openly playing his Grimm card if it meant getting her to back off. It’s all the more inspiring considering who Nick is up against.

Renard continues to be a source of mystery, but his character is so crafty and fun (even likeable) that he doesn’t end up being a source of frustration. However, it seems that his craftiness is beginning to veer into desperation a little bit as he openly defied his cousin, and therefore his family, into giving up the key or the Grimm.

As for Team Nick, Rosalee and Monroe continue to be fantastic together, and the way the three of them work together is far more interesting and fun than Nick and Hank as partners. Who else would be so willing to help a Grimm and save Adalind’s victims with the world’s creepiest Neti Pot?

Finally, there’s Adalind. Her “final” showdown with Nick was a lot of fun to watch, and I assumed she was going to die, but instead only her powers “died.” Which is probably a punishment far worse than death for her, but I hope it’s an opening for her character to come back.

Other thoughts:

• Renard’s cousin revealed his first name to be Sean.
• Wu enjoyed some chapstick, coins, and some carpet this week. Sadly, that looks to be the last of it since Team Nick cured him.
• I’m still curious what kind of abilities Nick has as a Grimm. He’s a very capable fighter as we’ve seen, and he can see Wesen’s true form, but are there any more?

What did you think of tonight’s Grimm? What are you theories on what is brewing in the background? Does Nick have more Grimm abilities? Does Hank now know about Nick? Let us know in the comments!