The episode begins in the studio of Gabriel Agreste. Gabriel is disappointed with his son because he watches the surveillance videos and sees his son take his book.
"You can explain?"
"You hid a lot of things ... I didn't know this book was important to you." Adrien tells him.
"This book is my inspiration and ... Your mother's gift left me before she left us. "
"I'm sorry."
"Where is he? "Gabriel asks with a dry trunk.
"I don't know, it was in my bag. "
"That's enough. From now on you will be resigned to the house. You will no longer have the right to leave the house except for your photoshoot and to see your friends. "
"But father ..."
Gabriel motioned for the bodyguard to bring Adrien to his room.
Clever, Adrien lets off steam by smashing his studio. Adrien can hear that his father is really angry.
The workshop messed up, Gabriel goes to his lair with a book and transforms into Hawk Moth. Makes a white butterfly evil in black.
"Fly you little Akuma, go black this father is angry at being betrayed by his own son!"
The black butterfly flies away but remains in the lair.
"Nooro, disrupt."
"Master, why is the Akuma here?"
"Say for that villain, I'm going to have to be someone else. Nooroo, I'm giving you up! "
The butterfly Kwami is sucked by the jewel. Gabriel takes the book and Akuma is engrossed in the book.
Gabriel becomes the collector.
"My most precious possession has been stolen. Thanks to this book, I will be able to make a new collection and recover the Miraculous of the heroes of Royal Wood.
Collector goes outside, throws his book like a boomerang. Any object or people who touch it are sucked into the pages.
Meanwhile, Marinette is with the Miraculous Guardian and the elderly man is reading the pages.
"Tell me Marinette, how did you get this book?"
"I .. Found him on the park bench."
"Don't you know who owns it? "
"No..."
"What a pity, Master. "The Turtle Kwami said.
"Why?"
"If you knew the owner, we might have finally discovered Hawk Moth's secret identity. Disable him and get the Butterfly Miraculous back."
"I see… Hawk Moth can be anyone. Be careful."
"Of course…" Marinette comes out of Master Fu's house.
Marinette doesn't like the idea that the boy she's in love with is the supervillain who is causing trouble to the citizens of Royal Wood.
"Why didn't you tell Master Fu?" The Ladybug Kwami asks.
"It's just I couldn't stand Adrien being Hawk Moth. I'm sure he has an explanation. "
"Like what? His father? The most mysterious person in Royal Wood? Who hardly leaves his home. Still locked up? " Tikki said
"Gabriel Agreste ... Of course. It must be Hawk Moth. "She realizes that Tikki is not wrong.
She hides in an alley and transforms into Ladybug.
"Black Cat and Ace of Kings, I know the identity of Hawk Moth." She sends a voice message.
She jumps on the roof of a building. Chat Noir and Ace de Roi join Ladybug.
"What's the emergency?" You ask.
I discovered the identity of Hawk Moth. "Ladybug announces them.
"Who is it?" Chat Noir asks.
"Gabriel Agreste. "
"Gabriel Agreste? "The two boys are shocked by this discovery.
"Yes, think about it. He doesn't show up outside often. He has the butterfly logo on each of his products. "
The ladybug girl shows the butterfly logo on one of the Gabriel Agreste products.
Adrien alias Chat Noire now notices that everyone in the house has this logo.
"..."
"Are you okay, Cat?"
"Uh ... Yeah, it's okay. Settle our account. "
The three heroes jump from roof to roof to go to Gabriel Agreste's house.
Lee walking saw the three heroes and a supervillain following them.
"Hawk Moth to turn an innocent into a villain. Sass, let's go help them. "
"Yes."
Lee goes down an alley and transforms into the Viperion.
The snake boy is going in the direction they have taken.
In the Agreste mansion. The three fight against a Collector who wants to enclose them in the pages of his book.
Viperion arrives at the Agreste house and hides behind the window to use his power.
"Seconde chance!"
Ace of King throws his cards to him but is absorbed by the book.
"My cards!"
"Another idea?"
"He can store things in his book and it has to take up a lot of space."
"Whose solution will be to fill it? "
"Exact. "
"Lucky Charme!" A bicycle pedal appeared.
At the moment that was about to fall, Collector sucked up the object in his book.
"My Lucky Charm! "
"Your turn! "
Ladybug is captured in the book.
"My lady! You will pay! "
"Black Cat, wait!"
Cat does not listen to him and rushes towards the enemy but is also sucked outside the book.
"Two less. You joined my collection, Ace de Roi. "
Viperion goes back in time before that happened.
That's time, he joins them and throws a flowerpot at Collector.
"Who are you? "
"Viperion. Carrier of the Serpent's Miraculous and I'm here to help them. "
"So are you their ally? You will also join my collection and I will take your Miraculous too! "
He's tackling the four. The four heroes do their best not to get sucked into the book.
Ladybug uses her Lucky Charm which makes the same thing appear every hour, a bicycle pedal.
The fight continues in Adrien's room.
"Wow, Adrien has tons of movies and video games. "
"Ace, focus!"
"Wait, can we use this?"
"Cataclysm!"
With his destructive power, he destroys the casing of films and video games that fall to the ground.
Ladybug takes the table football and the pedal to make a catapult.
"Boys, ammunition! "
"Including."
All the discs are thrown at the enemy who captures them with his book.
Each of the discs is absorbed and advances towards Ladybug.
"I could do it all the time. "
He's out of ammunition.
"He has no more records. "
"My Lady!"
"I won! "He tries to suck the ladybug girl in, but the pages are full.
"What!?"
Viperion throws his lyre at the hand of Collector who loses his book.
Ladybug tears him apart and Akuma comes out and captures him.
Gabriel becomes as before. All the things that sucked in his book came out.
"Adrien? Where is my son? I don't want to lose it. "
"I'm sure he's back in his room thanks to Miraculous Ladybug. "
"I am happy. "
The four heroes leave to prevent their transformation from being canceled.
"Apparently they have a new ally. I grab it with his Miraculous. "
The next day. Marinette is in Middle School.
Marinette through technology. She takes digital photos on the phone for Master Fu.
She absentmindedly put the book back in Adrien's bag.
"I must have put it in my bag without noticing."
Gabriel finally got his book back.
"Why do you need it when you have digital photos of the book?" Nathalie asks.
"To protect my secret. I had to do everything so that they did not discover mine. "
He puts the Butterfly Miraculous back on his tie.
"Sooner or later I'll get their Miraculous back and my wish will finally come true. "