Status Updates From Uncanny: A Chilling Standal...

Malleus managed to acquire her soul, but just as she did, Willow Jane wrapped her gossamer around her eyes and stabbed through her soul and her body, causing her to be reduced to an ash-black skeleton, and successfully beating Malleus. The fates arrived and granted Willow one boon, she wished for the people lost in the shadows to be returned.

Willow Jane learns she is an "Uncanny" and she can stop and rewind time at will by doing various things with a metal filament that comes out of her thumb, but she can't rewind too far or stay frozen in time for too long because it can kill her, these time stops are called "Glimpses". Willow and Harken have agreed to trade a family heirloom to the Malleus in return for her sister who she had kidnapped.

Will Patrick and Kelly have died and Willow Jane has discovered she has unusual abilities, mostly time-related, the shadowless have attacked Willow and Devon, successfully killing Devon, but Jane escapes with the help of Harken, afterward, Willow finally reads the letter from her dad and she learns he expected from the beginning that she would one day meet Harken.

A good book, Willow Jane is having multiple halucinations and various things causing her to do things such as write an anchient poem with chalk. Harken is an anchient magick user who used to serve the Shadowless who is an anchient evil witch.