Two doctors called Diane and Andrew are studying an mental patient called Thomas.Diane then feels she loves him and threatens Andrew with death if he does not let Thomas run the hospital.Andrew has no choice and lets Thomas out.Thomas,However,Kills Andrew but leaves an dying Diane.Diane phones her freind to escape from the marple island to marple city.Diane then sees all the convicts geting let out by Thomas in the security camara and dies.