Dr. Charles grapples with his own mental health after working the suicide prevention line on Chicago Med’s April 1 return episode “The Book of Charles.”

The episode places Dr. Daniel Charles (Oliver Platt) front and center in two compelling episodes, with the second hour “Altered States” airing Wednesday, April 8.

First look photos from “The Book of Charles” airing Wednesday, April 1 (08:00PM – 09:00PM) on NBC.

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CHICAGO MED -- "The Book of Charles" Episode 1115 -- Pictured: (l-r) Sarah Ramos as Dr. Caitlin Lenox, Luke Mitchell as Dr. Mitch Ripley -- (Photo by: George Burns Jr/NBC)