Can he prove it was a good shoot?

MATT OLMSTEAD:Were starting withFirein the 9 p.m. hour on Tuesday, switching withMed.

They respond to a fire where a woman looks like she may have been trying to commit suicide.

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Credit: Elizabeth Sisson/NBC

Were not quite sure.

When we take her to Med, her levels are all off.

Its a medical mystery, which throws us into theMedhour.

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Elizabeth Morris/NBC

Short of that, its just medical malpractice.

Its becomes increasingly nefarious.

What can you tease for the fight to save Herrmann and how its affecting everyone?

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Matt Dinerstein/NBC

It really rocks everybody.

Beyond the immediate concern of Herrmanns fate, its how this happened, why this happened.

What can you tease of the hunt for Freddie, the man who stabbed him?

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Matt Dinerstein/NBC

Its not just some nondescript detective coming to help out.

Its an intense investigation also involving Cruz, who knows that world.

Whats interesting about it is its the opposite.

Theres a scene in there where theres a confrontation.

Nine out of 10 times, Voight would be a little more active in that confrontation.

He was saying, I dont feel like being the bull in the china shop in this storyline.

He was wondering why that impulse was kicking in.

He doesnt want to disrespect her memory by doing anything that would upset her, essentially.

Once we started talking about that, it unlocked it for him.

OnP.D., were also seeing Roman deal with the aftermath of shooting that man.

What can you tease for that?

Roman thinks hes cooked.

Hes basically given up.

His character has a little bit more of a wary approach to politics and how things work.

Hes never wanted to go up to Intelligence.

He likes being a uniform cop, but hes been burned before.

Hes just resigned that theres no way hes going to wiggle off this hook.

Its gratifying for us, because this is a storyline that we planned from the very beginning.

Its Burgess, his partner, who hasnt.

Shes dogged in her approach to what really happened, because she believes her partner.

The three-way crossover kicks off withChicago Fireon Tuesday at 9 p.m.

ET, continuing withChicago Medat 10 p.m.

ET, and concluding onChicago P.D.Wednesday at 10 p.m.