01E05 - Malignant

Firefighter Christopher Hermann collapses and is brought in. He's being treated by Rhodes who earlier treated him for an injury who told Herrmann he's OK. His fellow firefighters all wonder did Rhodes let Herrmann go too soon. A woman who tried to commit suicide is brought in and when Charles looks at her things he doesn't believe she tried to commit suicide. So he asks Halstead to ask his brother to look into it. And they find a suicide note claiming she has cancer. But the post mortem reveals that while she was receiving cancer treatments she had no cancer. Later a woman is brought in who says she has cancer but no sign of cancer. And another woman brought in is also being treated for cancer whom they learn doesn't have. So they come to the conclusion that there's a doctor who tells his patients that they have cancer and is treating them. April's brother, a medical student starts working there and Reese takes him around and she eventually discovers he's inept, a thing which drives a wedge between April and Severide.