You don’t stop living when you die.
They're called Deadliners, they're spirits, and they play fate with human lives. These 'deadline assignments' have unfinished business which must be cleared by the time they die. What the deadliners don't know, is that by helping others, they clear karma of their own.
They're a strong group of spirits who would do anything for one another - until one of them has to let the leader’s wife die.