After a family vacation, Kyle Lewis gets a headache and a high fever. Initially diagnosed with meningitis, doctors started treatment, but quickly realised it is something else.
Neurologist Dr Autumn Klein collapsed and was rushed to hospital, but after three days in ICU she passed away. Doctors investigate the mysterious cause of death.
Thomas Rybinski was treated for suspected meningitis, but his condition worsened. When other patients began to have the same symptoms, doctors had to act fast to save lives.
Mark Staudte abruptly became ill, experiencing seizures and his skin turning yellow. Within 48 hours, Mark died, and five months later, his son developed similar symptoms.
Changes started subtly for twins Addi and Cassi, but after medical testing it was discovered they had a strange, genetic disease that causes progressive neurological deterioration.
Seven Chicago residents died under mysterious medical circumstances. Diagnoses included cardiac arrest, stroke and aneurism. However, a connection is made to all seven victims.