When a bounty hunter who hunts refugees from an alternative Earth uncovers he too is an alternate, he must put an end to his employer’s pursuit of him and those like him

Cool, but hard to envision an "alternate" Earth and protag, what kind of refugees he hunts, and how he goes from a hunter to being hunted.

EXAMPLE:
"A bounty hunter of e.g. refugee humanoids must ..."

Hope this helps, take care.