Lieutenant Matthew Casey (Jesse Spencer) will utilize his pacifying skills to deal with a new case in the next episode of "Chicago Fire" season 4.

According to the synopsis for the upcoming episode, Casey will try everything that he can to solve the issue involving a high school student who became a victim of a gang retribution incident.

The trailer for the upcoming episode shows Casey spotting the teenage boy tied by a rival gang to an electrical post. He knows that the animosity between the gangs is very serious, and the boy could be killed if he will not do anything to stop it. So he tries to make a deal with an unlikely ally, but it might not work according to plans because the gangs do not necessarily trust the local authorities.

Meanwhile, the synopsis also reveals that the episode, titled "I Will Be Walking," will feature Paramedic in Charge Sylvie Brett (Kara Killmer) and Jimmy Borelli (Steven R. McQueen) assigned to help a woman who extremely likes him.

The episode will also feature a hilarious banter between firefighter Christopher Herrmann (David Eigenberg) and a woman named Stella (guest star Miranda Rae Mayo) as they compare their bar management skills.

The official synopsis for the episode reads:

"When a high school student becomes an innocent victim of a gang retribution incident, a very determined Lt. Casey tries all means necessary to resolve the issue. Severide (Taylor Kinney) lends a hand to Detective Holloway (guest star Jenny Mollen), who is working a dangerous undercover investigation, and watches over her 9-year-old son at the firehouse. Brett (Kara Killmer) and Jimmy (Steven R. McQueen) are called to aid a woman who takes a fond liking to Jimmy. Meanwhile, Otis (Yuri Sardarov) makes a surprising discovery that leaves him very concerned and Herrmann goes toe-to-toe with Stella to claim bragging rights over who can best run a bar."

The episode airs on Tuesday, April 19, on NBC.