After the thrill ride that was "The Bullet in the Brain" last week, this episode of Bones couldn't help but feel like a letdown, while also providing perfect counterbalance.

At its core, Bones remains a quirky, fun show with engaging characters, witty banter and a lot of cool science thrown into surprisingly complex crime investigations.

"The Sin in the Sisterhood" was true to form on all fronts.

The polygamist angle to the week's murder case opened up plenty of twists - a potato used as a silencer, the victim being poisoned, a secret divorce - and plenty of discussion.

Is it wrong for to take multiple wives if they are all complicit and working together as part of the same happy, family unit? There's an argument to be made that no, it's not.

Of course, this was not a happy family in the end. Three wives with separate issues made for three suspects right off the bat, and more than enough motive to go around.

Especially when we learn that Ed Samuel was being unfaithful - to all three.

The mistress didn’t know Ed had three wives, but worked in lab that used to have radium salt until it was stolen. That poisonous substance later turns up at the Samuels'.

Youngest wife Carol claims responsibility, saying she didn’t want to kill him and just wanted more time with him, which she got when Ed was sick, given her nurse training.

They book Carol on attempted murder, but that doesn't explain the actual murder. The King of the Lab cracked that with clever analysis of bullet trajectories and residue.

The wives' father was fed up with Ed's treatment of his daughters and shot him in a cornfield. He nearly got away with it, but the tell-tale clue was his feeding of turkeys!

Bones' spin on Big Love was well done and kept us invested in the case for the most part. Though if you were considering a polygamist lifestyle, this likely didn't entice you.

Cam was the center in the night's biggest subplot, which was a fun chance of pace. It's hard having a personal life and being successful at what you do. Just ask Brennan.

The shot-caller's stress-relieving, gun-firing antics were amusing and delightfully out of character, and her decision to meet Dr. Paul for dinner at the end was a nice touch.

As far as "Evil Booth" (the sniper), Good Booth's relationship with Hannah, or the unrequited, star-crossed love between himself and Brennan, there wasn't much progress.

This wasn't the worst thing, though, as we said earlier. In fact, a return to normalcy was actually a welcome respite from some of the intense installments we've seen lately.

Booth's comment about being able to love multiple people, but always loving one person most, was probably the only swoon-worthy moment in this mostly lighter episode.

The underlying tension between Booth and Brennan is well-established. She can't pour her heart out 24/7. It's nice to just watch them interact at work, like the olden days.

For example, the conversation in the car, where they rattled off ways to describe the victim was pretty classic. How often do you see Temperance so relaxed and laughing?

Our two favorite Brennan lines from last night:

1. Remarking matter-of-factly that Cam's mood was the result of "sexual frustration"
2. Adding, excitedly, that Hannah "enjoys the consumption of alcohol VERY much!"

What did you think of last night's Bones? Comment below!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.