On the next episode of NBC's police procedural drama series "Chicago P.D.," the detectives of District 21 will take on a new case, the murder of a famous crime videographer who has unearthed the well-kept secrets of a wealthy family. Will the detectives be able to go against this family of power and wealth?

"Chicago P.D." returns this Wednesday with an all-new episode. As revealed in the synopsis for episode 18 of "Chicago P.D." season 4, titled "Little Bit of Light," the death of the videographer Bobby Trent (Michael B. Woods) will shed light on the crimes committed by a wealthy family. Woods' character manages to film evidence that could tie one of Chicago's wealthiest families to old secrets, which explains their ill-gotten wealth.

"A ruthless billionaire with unlimited resources, but when someone ends up dead, the showdown with Chicago's finest begins," the trailer for the episode teases.

Elsewhere in the episode, viewers should see a new character named Nicole (Jules Willcox), Burgess' (Marina Squerciati) sister. The former will arrive at the District to pay her sister a visit. For some reason, she seems to give Ruzek (Patrick John Flueger) the cold shoulder.

Nicole will have a bigger role to play in next week's episode, titled "Last Minute Resistance," when she becomes a victim of a horrifying sexual assault. Burgess, who convinced her sister to paint the town red, will feel guilty when she learns that her sister is not able to come home. But she will feel worse when the team discovers her clinging to life at an El Station.

Fans of the show can expect to see series regulars Jason Beghe, Jesse Lee Soffer, Sophia Bush, Elias Koteas, LaRoyce Hawkins, and Amy Morton in the upcoming episode. Joining Woods as a guest star in episode 18 are Kim Shaw, Chris Agos, and Patrick Page.

"Chicago P.D." season 4 episode 18, titled "Little Bit of Light," airs this Wednesday, March 29, at 10 p.m. EDT on NBC.