This article may contain spoilers.

On the heels of last weeks blow-up adventure in Washington, D.C. where Pete (Eddie McClintock) and Myka (Joanne Kelly) were ambushed by implosion grenades and a villain out of Arties (Saul Rubinek) past, this week we had a bit of fun Vegas-style. It started innocuously enough with Pete play ping-pong with himself using the infamous Lewis Carroll mirror. But, with the inadvertent crash of the Studio 54 Disco Ball, Myka was caught in the cross-fire of two artifacts reacting to each other and a whole lot of escapades ensued.

In hindsight, the song I Will Survive, which played when the disco ball was lit-up, proved only too prophetic as the Studio 54 Ball, which was cursed to reflect trapped desires, projected those yearnings and cravings onto everyone within its sphere. Or, as Artie darkly summed up, it imprints grim humanity against anything decent.

Unfortunately for Myka, she was caught by the balls influence which then thrust her into the Carroll mirror where she took the place of the woman trapped in the mirror - Alice, who happened to be the muse of Lewis Carrolls story Alice in Wonderland, except this Alice was not so innocent and nice. Thus, with a sleight of hand after being suddenly released from the mirror, Alice took Mykas place. And with Artie distracted with the thought of MacPherson running around plotting his next move, Claudia and Leena (Genelle Williams) worried about Artie and his preoccupation, and Pete rushing off to Vegas in search of two small-time thieves with iniquitous hands, Alice was free to tag along and fly under the radar. After all, she looked just like Myka, with only a hint of the underlying darkness.

Once finding Gary and Jillian (nicely played by Niall Matter and Erica Cerra of Eureka) at the gambling tables in Vegas, Alice slowly began to weave her web of deceit while Pete seemed oblivious to the identity switch of his partner. You would have thought the fact that Alice made a complete 180 degree physical transformation into a black-widow-of-the-night would have tipped Pete off. But, as Pete admittedly said to Alice, you just knocked everything crooked, when he first saw her in that little black dress.

That, followed by Alice casually mentioning the definition of Carsons Rule of Linear Transfer (which means that forced outcomes require tangency), still did not raise any red flags as Pete just chalked it all up to Myka being Myka. This blissful ignorance was fortunately short-lived and after a nice brutal knock-down fight, Alice finally tasered Pete with the Tesla and left him and Gary for dead. Though Alice was curious enough to ask Pete, what tipped you? and Pete responded, the real Myka would never kiss me - not if her life depended on it.

So, while Pete was battling Alice, Claudia was doing her darnedest to convince Artie that they should hear out the Myka trapped in the mirror. For to Claudia, Myka looked just like her brother did when he was trapped in an alternate dimension and thus was quicker to pick up on the signs. Hence, when Claudia asked Artie, Is that Myka? and Artie replied, whatever it is, its not good, Claudia persisted and asked him again, why dont we just ask her? But Artie, not wanting to consider the possibility, retorted, because we do not converse with reflected entities. He further explained that because shadows have power that it was unwise to play with them. But Claudia was bound and determined to see what the mirror-Myka had to say, so she figured, if the CIA can use laser mics to read vibrations off of windows, she can do the same on the Lewis Carroll mirror to figure out what mirror-Myka wanted to communicate.

It was therefore rewarding to hear the first words from Myka, Artie, when I get out of here, Im hugging her [Claudia] and kicking your ass! It was only after Artie eventually noticed that mirror-Myka kept leaning her head to the right, like when shes mad at him did he finally consent to hear what she had to say. It was not really what he wanted to hear, but it held a ring of truth to it when she said, heres what we both know - I dont trust you, but I need you to tell me the truth. You cannot treat me like a chess piece that you can move around on a board that only you can see.

"Duped" was all about: how well do you know the person you think you know. In Petes case he knew that Myka would never behave the way Alice did; and for Artie, it was about recognizing Mykas own personal traits and her anger and fear over his deliberate attempts to keep her in the dark during missions. In the type of work they do, it is critical that they not only know each other well enough to recognize an imposter, but they also have to trust and rely on each other for their physical safety.

What Worked

Again, the dialogue is getting stronger and stronger with each new episode. It was fun to hear such lines like Artie: Im pretty hard to kill when Leena chided him about being more careful in his hunt for MacPherson; and Petes quick quip, Yes, my liege, I will bring you receipts after Artie gave him the $10,000 in cash for the Vegas trip. Also quite fun was Arties rhetorical response to Petes curious inquiry about where all the artifacts came from, where do any of these things come from?!

Also nicely portrayed is the growing closeness of the relationships amongst Pete, Myka and Artie. For example, when Pete told Myka that he knows that when she is angry with him that she stretches her neck up like a giraffe, but when she tilts her head to the right, shes angry with Artie. This was a key distinction that Artie obviously knew about as well.

And, while it has become a signature staple, every time I see those glossy purple gloves for handling the dangerous artifacts, it makes me giggle. It is a wonderful visual reminder that the artifacts are evil, icky things that must be handled with care.

But the crowning moment of the entire episode was hearing that Myka had named her ferret Pete, after her partner, and was too embarrassed to tell him. It epitomized their Im fond of you, but you frustrate me relationship.

What Didn't Work

I found it hard to buy that Alice could adapt so easily into Mykas skin and she was too confident that she could pass unnoticed. For a person just recently released from a mirrored-hell, you would have thought Alice would have been a bit more jumpy and less comfortable taking on the body of a trained Secret Service agent. Her seduction and fight moves were too precise for a young girl, such as was depicted in the end when she was re-trapped in the mirror.

Giving Credit Where Credit Is Due

"Duped" was written by Benjamin Raab and Deric A. Hughes and directed by Michael Watkins. "Warehouse 13" stars Eddie McClintock, Joanne Kelly, Saul Rubinek, Genelle Williams and Allison Scagliotti.

"Warehouse 13" airs Tuesdays at 9 p.m. on Syfy.