Sacred Oaths - Marvel Fanfiction

Annual reviews make everybody nervous, especially when you're a Senior SHIELD Agent who is being watched by all of your superiors, knowing full well the simplest mistake can make or break your career. Thankfully, Keira Johnstone didn't have to worry about leaving SHIELD, but the fact she has to face HYDRA head on; following an investigation on a missing sorcerer named "Ashley Carrie."

Following the investigation, she discovers the possibility of a sacred book by the name of "Death's Reaping," capable of mass destruction. But when Keira ends up missing and then turn up two days later emotionally changed, (despite insisting she is fine) does she start experiencing things out of the ordinary. Things nobody can explain. But when they get an unexpected visit by Earth's Sorcerer Supreme, do they realise they're handling something much, much more dangerous than they realise.