Starts off in Season 2. Instead of curing Juliette himself, Renard gives Nick the cure in exchange for the key. From there Juliette wakes up with no memory of Nick but finds herself unbearably enamored with him. With this Juliette also becomes curious about Nick's secret life and starts searching for answers.
Disclaimer: Disclaimer: I own nothing, 'Grimm' is the property of the NBC Television Network, created by David Greenwalt, Jim Kouf, and Stephen Carpenter.
Renard was driving toward Catherine Schade's home to retrieve the cure for Juliette's comatose state and was going over his plan on the way. If he administered the cure himself he would wind up in a situation that would not only put him at odds with Nick but would also put him in an difficult situation. That would put his chance at gaining the Grimm's cooperation at risk and put a bigger dent in the trust he already has than necessary for when the time came to reveal himself.
The royal bastard was still mulling it all over while he waited for Catherine. When the hexenbiest returned with a jar an idea came to mind.
"Well, it looks like like you're in for quite a ride." Said the older Schade witch.
"This cure, will it work if the Grimm administers it?"
Upon hearing this Catherine arched her brow in both surprise and thought. After thinking it over for almost a minute she answered.
"I don't see why it shouldn't." Responded the older Schade woman.
"Perfect." Said the half Zauberbiest, taking the jar.
...
Nick Burkhardt was not having a month. So far he hadn't gotten any word from Rosalee about curing his girlfriend, Juliette and his and his mother's respective visits to Catherine Schade had gotten him nowhere. As he was driving away from the Portland Metro from dropping off his not-so-dead mother he got a phone call.
"Burkhardt." Answered The detective.
"If you want to save your girlfriend handover the key." Said an electronically distorted male voice.
"Who is this?" Demanded the Grimm. "And how exactly can you save Juliette?"
"Meet me at the place where this all started, where it all began. You've got one hour."
With that, the anonymous caller hung up. Nick knew exactly where he meant and sped up, driving as if Hell itself were on his tail.
Nick arrived at the Postman's cabin, the site of his first Wesen hunt.
After waiting ten minutes another car pulled up. At first, there seemed to be nothing special about the car, but Nick felt an eerie sense of familiarity. It was only when the driver stepped outside the vehicle, he recognized him immediately.
Renard.
Suddenly the pieces of the puzzle fit. Renard had a connection to both Adalind and her mother. Adalind tried to kill Aunt Marie because he told her to. She put Hank in danger to coerce him into giving her the key because Renard ordered her to.
"It's you! You're the Royal!" Nick half shouted in rage.
With that, the Grimm launched himself at his Captain and started trading blows with him. Renard managed to throw his subordinate off of him and revealed his Woge.
"Nick, let me explain!"
Burkhardt got to his feet and stared at the literal bastard with fury in his eyes.
"Because of you Adalind almost killed Hank! You tried to have my aunt murdered and she died because of it!"
"Nick there are so much more important things coming and together we could make history or else history will bury us." Responded to Renard, while carefully reaching into his car.
Nick tensed but stopped himself from attacking immediately when he saw the captain produce a jar containing a white substance.
"Believe me Nick, I don't want anyone else getting hurt."
Renard handed the jar to Nick who took it hastily.
"Drink that and when you visit Juliette tomorrow kiss her."
"Wha- like in Snow White or-or Sleeping Beauty?!"
"Exactly."
"I don't owe you anything and you're not getting the key."
Nick looked at the jar and immediately began walking to his car. Just as he was opening the door the Royal Bastard spoke.
"Nick, I'm not going to lie to you, that cure will have consequences– side-effects! For both Juliette and you!"
Nick didn't care he got into his car and drove off.