We really got down to the "Brass Tacks" this week on White Collar. There's a dirty Senator up to no good and Neal and Peter will stop at nothing to get to whatever he's hiding.

Unfortunately for the bureau, this investigation certainly won't be without its costs.

I didn't think we'd see the day when physical harm came to Peter, but when it did, it created all kinds of problems for Elizabeth, Neal and the bureau.

Rarely do we get to see Elizabeth express her feelings to Neal to the point of asking him to lie. In fact, it's normally been the exact opposite - she's usually trying to make Peter give Neal the benefit of the doubt in that department. It really hurt to see Neal fib to Peter's face, and his lack of evasiveness should have been a tell-tale sign to Peter that something more was at play. To have Elizabeth stand there and watch it was even more unnerving.

Then again, Peter is her husband and I can fully understand her impulse to keep him out of harm's way.

But while Peter was in the hospital, Neal and Diana got to spend some quality time together, which was a nice change of pace, despite the circumstances. I will say, though, that their Barber Shop takeover prior to Peter's crash was perhaps one of my favorite instances of crafty conning. The phone switch was pretty flawless for its off-the-cuff execution. Let's hope there are more moments like that to come!

And what about that troublesome key? Leave it to Jeff Eastin and company, and to the last sixty seconds of the episode, to deliver a revelation as novel as the key acting NOT in its obvious capacity, but rather as a skyline map of some kind. Genius, I tell you! It certainly will be interesting to see Peter and Neal tracking down the same lead unbeknownst to the other.

Highlights from this episode:

• Mozzie surrendering his "first born" for the greater good.
• Neal in that blue suit... it was really a shame we couldn't get that trending on Twitter. It was stunning.
• Getting a chance to see Mozzie and Jones team up for once, and Diana and Neal getting some partner work in as well. 

Where in New York do you think that key will lead our favorite FBI agents and consultant too next week? Sound off below!

C. Charles is a TV Fanatic Staff Writer. Follow her on Twitter.