While in the field, Violet and Novak are thrust into a dangerous and fast-escalating situation, on Chicago Fire’s April 22 return episode “Instinct.”

The situation soon forces the pair to rely on their instincts in order to protect both themselves and a vulnerable patient.

The “Instinct” episode of Chicago Fire airs Wednesday, April 22 (09:00PM – 10:00PM) on NBC.

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CHICAGO FIRE -- "Instinct" Episode 1418 -- Pictured: (l-r) Hanako Greensmith as Violet Mikami, Garrett Coffey as Ryan, Jocelyn Hudon as Lyla Novak -- (Photo by: George Burns Jr/NBC)