Pascual León, a retired 65-year-old man, starts an elaborate plan of revenge after being diagnosed with Alzheimer's. Meanwhile, Jimena Guerra, a policewoman, finds a mysterious message addressed to her at the crime scene.
Jimena begins the investigation on the Judge's murder. Tired of the attacks from the press, she decides to confront Francisco Pira, while Pascual carries out the next stage of his plan, not without some surprises.
Pascual recovers from a health problem and continues with the next stage of his plan. Meanwhile, Jimena Guerra makes new discoveries: it is the work of a serial killer and Asunción de la Sal seems to be a key piece in the investigation.
Jimena investigates the house fire in Asunción, while Pascual proceeds with his list of murders. However, unexpected events cause him to make some choices that aren't part of the plan. A new lead about a killer "cat" appears.
Pascual kills his third victim and meets with an old friend, millionaire Olmo Bonete. During her trip, Jimena discovers some shady secrets about her family and the town's past.
Due to a provocative and twisted news article, the art exhibition faces a crisis. However, Da Li finds a solution on her own and turns the situation right around. Moo Hak stays up all night thinking of Da Li's well-being and goes to the gallery early in the morning to help her, but his help turns into chaos.
Rise and shine! While Ernie helps Bert with a morning do-over, Elmo and his new friend Ziva are joined by comedian and TV show host Amber Ruffin for a teeth-cleaning challenge. Then, Bebe Rexha sings about morning routines!
The next generation of "American Ninja Warrior" begins, as some of the show's biggest fans now get an opportunity to compete for the chance to be named American Ninja Warrior junior champion.
Kevin is rejected by a butterfly and tries to dig a tunnel to hell, but he unearths a talking skull who wants to hang out. Tanya and Ernesto clash with the butterflies, and Kevin fails to invite his friends to laser tag.
Yoh's friends are stunned by the revelation about Hao. Later, a mysterious masked man appears before Team Ren with an offer to make them stronger.
Céline and Daphne discover that one of the families affected by the tragedy is staying at the hotel. The collapse claimed the life of little Felix and caused an amputation of his sister Joanie, now a young adult. The Prévost clan is reeling.
At Chateau Frontenac, a body cemented in a bath launches Céline on a new investigation.
More and more suspects appear for Philippin's murder. The first suspicions fall on Prévost, who was found in a coma after attempting suicide; the attraction between Alex and Joanie is inevitable.
Céline and Daphne discover that Esther was an engineer specialising in large structures. With a committee of experts, Esther was in charge of evaluating the options for the construction of a third link between Quebec City and its southern shore.
The room in which a discovery of a person named Philippin was found was rented by a woman named Esther Smith.
Nathan knows Sylvie and the Prévost family well; Daphne discovers that to avoid being removed from the case, Céline has withheld information from her linking William to Esther Smith.
Céline, supported by Alex, discovers that Philippin was developing a high-performance concrete. Enough to crush the competition: solid, durable, and 10 times less polluting than the others on the market. A discovery that would be worth billions.
Céline assaults William and Jacques removes her from the investigation; Daphne continues the work; Chamfort, with financial support from QMG, was providing Philippin with the means to carry out research in the lab.