Charm Offensive - Martin Cate

The Witches Three agreed to split up to better investigate their mother’s pasts. Brianna lurks deep in the witchiest parts of Boston, researching in secret libraries and questioning covens that date back further than the English colonies. Sophie stalks mysterious wielders of magic through parts of the French Quarter of New Orleans that tourists never see. 

And Amanda, alone in Miss Zenobia Weekes’ Charm School for Exceptional Young Ladies, breaks all the rules. She juggles her time between 2019, coordinating the investigation with the other two, and 1928, where Edward awaits her. She knows she can’t go on living two lives forever. Always she expects the 1928 coven to ambush her.

To her surprise, the attack comes in 2019, when her good friend Nick disappears. Not like a missing person, but like he never existed. His own grandfather doesn’t recognize his name or photo. 

Investigating murders? Old hat for the Witches Three. But investigating a person who never existed? Could be tricky.