Cisco and Chester travel back in time and get stuck in 1998, repeating the same day over and over again. The key to returning home is at Chester's childhood home but he refuses to visit.
Ellis leads the friends to the Cursed Caldera but warns it's crawling with nasty monsters. Viren tries to force Runaan to talk.
En route to Étretat with Claire and Raoul, Assane encounters an unwelcome figure. In a bind, Assane sends a message to Capt. Laugier.
Years after a tragic injustice, Assane seeks to settle a score — and a debt — by stealing a diamond necklace, but the heist takes an unexpected turn.
Assane hatches a plot to contact Comet, an inmate who steers him to a clue about Babakar's demise. Anne Pellegrini comes clean about the past.
Assane confronts Commissioner Dumont and plants a decoy to divert the police. Hubert Pellegrini's connection to Babakar's fate comes to light.
To retrieve incriminating evidence on Hubert, Assane enlists the help of a journalist. Officer Guédira connects the dots around the Louvre heist.
Bae discovers more about her mother's long-ago connection to Sherlock and Watson, while Billy contemplates revenge after a brutal reminder of his past.
Tae-sul and Sigma come face-to-face. In order to rescue Seo-hae, Tae-sul must endure an emotional trip through his past.
When a mysterious ice powered enemy frames Frost for a brutal crime, she must find a way to clear her name; Barry and Iris have a surprise houseguest, and Joe continues to deal with Kristen Kramer.