Paramedics treat a woman who's fallen headfirst through a glass door, leaving a deep wound across her head, and a man complaining of crushing headaches who has a family history of brain haemorrhages. They also attend a car that's embedded in a garden wall after a two-vehicle smash and are called out to a drunk man who's been found collapsed in the street and is clutching his chest. The paramedics turn detectives to try to figure out why a woman keeps passing out.