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.

Tae-sul is reunited with a trusty friend, who comes to him with a warning. A suitcase containing disturbing contents arrives at Asia Mart.

With the war looming on the horizon, everyone must make their choices. When Seo-hae heads to the only place she knows, Tae-sul finds her.

As Tae-sul tries to locate him, Sigma reveals more details about himself. Sun frees Seo-hae from the bunker.

Tae-sul asks Seo-hae to trust him no matter what happens — and demonstrates that nothing is fixed when it comes to matters of the future.

Jessie comes face to face with Inspector Lestrade at a crime scene, Bea plays cat and mouse with Watson, and Leo feels torn over his life at the palace.