I haven't cried during a movie in a long time, but then I've never had to watch a little girl suffer through a spinal tap before. Documentary makers Steven Bognar and Julia Reichert had just finished nursing their own teenage daughter through cancer treatment when they embarked on this six-year chronicle of five kids battling the illness at the Cincinnati Children's Hospital. Having been there themselves, they aren't afraid to record the most invasive procedures or the families' worst moments of anguish and doubt, which makes for a grueling but unforgettable experience. Some of the kids die, some survive, but all of them face the illness with a dignity that's the definition of heroism. Bring tissues, but don't miss this one. 230 min.