A three-year-old cancer patient comes in contact with a dangerous bacterial infection; Harris catches a mysterious illness and suffers from organ failure.

17-year-old Kristy has open heart surgery but suffers from complications; three-year-old Xinlin has a rare genetic condition that makes it difficult for her to stay alive.

A boy's life hangs in the balance as his heart falters. The bypass machine is an option, but it has its risks. Quick thinking in the children's ICU could make all the difference between life and death.

Three families witness their children undergoing overwhelming medical procedures, with no idea if they will be able to make it through or not.