In Osiris' Debt

When Severus died Hermione felt like her soul had been ripped to shreds. When Isis approaches her with a deal to bring Severus back in exchange for her help she immediately agrees. But what happens on the journey to bring Osiris back to Isis? What will Set do when he learns of their plans? Can they succeed where Isis herself failed(Updated sporadically) Hermione/Severus Isis/Osiris