A rookie female detective, out to prove herself, is tasked with protecting a single mother and her son when a serial killer learns that the young boy claims to be the re-incarnation of one of his victims, and tries to kill him again.

I agree with all previous comments.

My biggest question though is why does the killer care? Unless this boy can remember incriminating facts about the killer then surely, knowing this is a sure fire way to get caught, he'd just steer clear. What is it about the reincarnated person that the killer deems so important that he must risk his life to kill him again. Just as the protagonist must have a clear visual goal, the antagonist's goal must also be clear. How does the killer even learn about this? If the mother found out that her son was a serial killer's victim reincarnated wouldn't she just keep quiet? This setup also means that this serial killer has been wanted for at least say 4/5 years minimum? The boy has to be old enough to be able to express that he's reincarnated. What's the killer been doing all this time?

I feel there's a ?lot of implausibility that, whilst it initially sounds cool, actually ends up asking too much of the audience. The reincarnation bit is the hook - the audience must buy into this so strengthen how that element works. The boy can't just claim that he is... there has to be undeniable proof!

Hope this helps.

The premise hinges on the fact that people can be reincarnated. You'd have to make it clear beyond a doubt that the boy is indeed a reincarnation and he's not just claiming it.

This is tougher than I thought it would be. Here is an attempt:
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"When a boy claims to be targeted by a serial killer who believes he's the murderer's latest victim re-incarnated, a reluctant rookie cop is tasked to babysit the duo, but soon the protection duty turns deadly."