Trapped in tomb 66

Diana isn't who she appears. She can be anyone, but she chose to be Diana, the daring. She investigates all the unknown for the government of the United States. She is a hired gun for any supernatural being that needs killing. The smartest person to every deal with the creepy crawlies of the night.
But the one thing she isn't is proud of her past. She does everything she does to run away from the demons that dwell in the back of her mind.
And so far she has outpaced them until she is trapped in an ancient pyramid and enlisted by the spirit that lives there. She wishes to pass to the afterlife but is doomed to wander the earth. Diana has to find a cursed ruby to release her soul.
Easy? Nope.
She has no information, no idea how to get to it , she doesn't even know if she will survive long enough to escape the sands and her past. Plus she has to reach it before the demon kings minions do. Great add demons to the mix!
To make matters worse- she finds her future husband. Instantly she hates him, oh- he's also hes a fairy.
Yay! Will Diana be able to outsmart the clever centuries old traps, beat the opposing team, and navigate her knotted feelings for the fairy and herself?