Sometimes tragedies come in waves. First Eric, irrepressible, indestructible, climbing alone. Second Joey choking, drunk - though not much more so than usual - the night after his great triumph. But then there was the statistician, overdosing on Flatliners he thought were something else. Three is a series, not a coincidence: three men dead, three colleagues with a shared past. A past that is shared by the one person Kellen Stewart would trust with her life, pathologist Lee Adams. Suspect number one.