Don Nidaria, a Portland socialite with a quick temper, engages in a massive argument with his wife. They are preparing to go out to a black tie affair, but Don doesn't like the dress his wife is wearing. He chases her to the balcony of his mansion where she begs him not to hurt her. In a moment of defense, his wife accidentally rips his tuxedo, and Don morphs into a Lowen, a lion-like creature. His wife morphs into a Mauzhertz, a mouse-like creature. With his anger out of control, Don tosses his wife over the ledge, to her death. Unfortunately for him, his maid sees the whole thing.
Six months later, Don Nidaria is in the midst of a high-profile court case, facing murder charges. His lawyer, Barry Kellogg, is fantastic at his job and uniquely capable of convincing a jury to accept his line of reasoning. As he speaks to a jury, which includes Rosalee, almost imperceptible golden fumes dissipate from his fingers and are inhaled by the jury. Once consumed, the jury begins to warm up to Kellogg's account of the death of Nidaria's wife.
Nick asks Monroe over breakfast to bring Juliette to the trailer. He's on better terms with her at the moment. If the trailer helps bring back Juliette's memories, then she might remember everything, including her love for Nick. Monroe reluctantly agrees, and when he suggests it to Juliette, she doesn't even give him the time to reconsider. Once inside the trailer, Juliette notices the book and her memories begin to come flooding back. Monroe tries to keep her curiosities at bay, but Juliette becomes incredulous. What is all this stuff? Suddenly, she has a vision - seeing two Nicks, explaining what everything means in the trailer. Juliette has a panic attack and asks to go home.
In the Spice Shop, Monroe finds Rosalee lying on the couch, woozy with a headache. She went to jury duty earlier and started feeling "not so good" about halfway through. She doesn't have a fever or anything, but Rosalee thinks she's just mad at herself for abruptly switching her beliefs on the case. She came in thinking one thing but left feeling something totally different. Monroe tells her to get some sleep and offers to drive her to court in the morning.
Nick is surprised when Monroe comes home early, but his date with Rosalee was canceled due to her headache. Monroe tells Nick about his trip to the trailer with Juliette and mentions her multiple visions of Nick. That's a start! At least she's remembering him. Monroe's not so sure it's a good thing. Her memory is coming back, but it might be best if they just leave her alone for the time being. Meanwhile, at her home, Juliette has a nightmare full of multiple voices in her head, most of which are Nick's.
The next day in court, the maid who witnessed Don Nidaria toss his wife off the balcony, testifies in detail about what she saw. It's damning evidence, but Nidaria's lawyer Kellogg seems undeterred. With a calm to him, he approaches the maid and questions her about what she saw. As he speaks, golden fumes waft off of his hands, and she inhales them. Suddenly, the maid testifies that she saw something much different. She saw Mrs. Nidaria jump off the balcony of her own volition. The courtroom is aghast.
When the court takes a recess, Monroe, who was observing the case from the public seating, follows Kellogg into the bathroom and witnesses him sneak into a stall. Monroe sees a toad fall to the ground by Kellogg's feet and watches as his hands pick it up. Inside the stall, Kellogg eats the toad and morphs into a Ziegevolk. Monroe calls Hank and Nick, who rush down to the courthouse. Monroe is afraid Kellogg is tampering with witnesses and the jury, since he thinks he's a Ziegevolk. Nick explains to Hank that a Ziegevolk is a Wesen that eats toads in order to obtain the psycho-hallucinogenic influence over people through pheromones. Hank and Nick decide to take a look.
Inside, Nick and Hank enter to find Sgt. Wu on the witness stand. He was the first one on the scene the night Mrs. Nidaria died, and Wu's a consummate pro. There's no way Kellogg flusters him. Surprisingly, when Kellogg questions Sgt. Wu, his entire recollection shifts, just like the maid's. Monroe was on to something. It's got to be the toads.
In the Spice Shop, the guys inform Rosalee of Kellogg's secret identity. He's been bamboozling the entire courtroom with his pheromones. Hank wonders if there's some sort of potion antidote, but Monroe knows they'd have to give it to the whole jury if they want to get a guilty verdict, so that's out. Nick says they can't charge him with a crime because no one will believe them. With closing arguments tomorrow, the group needs to come up with a plan, and fast. Through research, Rosalee uncovers the gland inside a Ziegelvolk that produces the convincing pheromone. If they can produce a solution that neutralizes that gland, they'll thwart Kellogg. Unfortunately, they'll need his sweat for the solution...
At the police station, Captain Renard shows Hank and Nick a photo of Henri LeSeuer, the man he shot in the street after the man tried to blow up the bar Renard was in. The dead man's real name is Aguistin Katt, from Malta, and he worked for the Verrat. Renard tells them to let the lie be the truth regarding this man for the time being. If the Verrat are willing to go to these lengths, there's no telling what they might do. When Renard leaves, Nick tells Hank he believes Renard but doesn't know if he trusts him.
Juliette calls on Pilar, a wise old woman, to help her regain the memories she's lost. Pilar knows Juliette is on the border of two different worlds, one of darkness and one of light. Later that night, Juliette envisions Nick in multiple spots around her bedroom, speaking to her all at once, remnants of a thousand former memories. One of them tells Juliette he loves her. She can't seem to shake the chaos out of her head for good. Juliette closes her eyes and tries to will the noises away.
With a plan in motion, Monroe, morphed as a Blutbad, chases Kellogg on the street after the lawyer convinces a woman in a bar to come home with him. Kellogg breaks out into a frightened sweat and seeks refuge in the truck of a Wesen stranger. The stranger turns out to be working for Nick and Hank and secures Kellogg's sweat after offering him his handkerchief to cool down on. Back at the Spice Shop, Rosalee mixes the sweat into her antidote. The last step's the hardest part, though: they'll have to inject the antidote into the next frog Kellogg eats. The next day, before court, Nick and Hank interrogate Kellogg in his hotel room as Monroe sneaks in and finds the toad to inject. Unfortunately, he only has enough solution for one toad, and Kellogg has two. Monroe picks one and hopes for the best.
In Vienna, Adalind meets with Eric Renard and tells him his brother didn't give her the key. Eric is disappointed, knowing how high the stakes are. Eric thinks it's about time the Grimm knew about his brother and him. He looks forward to wrapping his arms around his brother. Before Adalind leaves, Eric notices something different about her; she's almost glowing. Adalind plays it coy, knowing how valuable the information of her pregnancy is. She tells Eric it's "because I'm with you."
In court, Kellogg gives his closing arguments to the jury, who inhale the pheromones he's still projecting into the air. Later, the jury takes a surprisingly short time to deliberate, and Monroe realizes he picked the wrong toad, as a not guilty verdict would've taken longer. But when Rosalee delivers the guilty verdict in court, the entire room is shocked, most of all Kellogg - who can't understand why his secret didn't work. Back at the Spice Shop, the group celebrates the verdict. Suddenly, Kellogg shows up looking for a potion to fix him and realizes the plot that foiled him. When he attacks Rosalee, Monroe beats him up, and Nick puts him behind bars for assault... right next to his defendant, Nidaria.