'Chicago P.D.' season 4 episode 21 spoilers, plot news: Who is robbing banks?

In the upcoming episode of NBC's crime procedural drama series "Chicago P.D.," Sergeant Hank Voight (Jason Beghe) and his team will have to deal with a series of armed robberies. Will they be able to catch the culprits before they can get away with another robbery?

"Chicago P.D." episode 21 to deal with a bank robbery Facebook/NBCChicagoPD

As revealed in the synopsis of "Chicago P.D." episode 21 of season 4, titled "Fagin," the team will be called in to handle an in-progress robbery. The thieves are responsible for a string of bank robberies in the city. Given that their heists have been successful, everyone from the law enforcement is anxious to place the suspects behind bars.

Aside from Voight, Detective Hailey Upton, who will be portrayed by guest star Tracy Spiridakos, will want to take command of the case. Although they share a common goal, Voight and Upton will not see eye-to-eye.

Upton, who is spending time with the district for this specific case, will be caught by surprise when she finds Platt (Amy Morton). The latter has connection to Upton's past.

While the detectives find a way to rid the city of the notorious bank robbers, Lindsay (Sophia Bush) will be left with no other choice but to reveal an unexpected face behind one of the robbers' masks.

The trailer for "Fagin" shows Lindsay inspecting the suspect who was knocked unconscious on the ground. From the looks of it, the robber seems to be someone Lindsay knows.

"What will shock everyone to their core is who is behind the mask," the narrator can be heard saying in the trailer of "Fagin."

Aside from Spiridakos, viewers can expect to see guest stars Carl Weathers, Monica Raymund, and Esai Morales appear in the forthcoming episode.

"Chicago P.D." season4 episode 21, titled "Fagin," airs on Wednesday, May 3, at 10 p.m. EDT on NBC.

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