The 5th Horseman

A young mother is recuperating in a top San Francisco hospital when suddenly she's gasping for breath. The call button fails to bring help in time. How and why did this happen? Lieutenant Lindsay Boxer discovers that this is not the hospital's first suspicious case. Other patients have taken unexpected and devastating turns for the worse just as they're planning to go home. Are these just appalling coincidences? Or is a maniac playing God with people's lives?