All in Bad Time (the Wisdom Court Series, Book 3)

Since her acceptance at Wisdom Court, Eve Stewart has been haunted by odd accidents and a voice in her head that she can't quite recall.
Upon arriving at the stately institute, Eve hopes to connect with fellow artists, but finds the women enduring strange supernatural occurrences while attempting to decipher the second journal of the Institute's late founder, Caldicott Wyntham.
The voice grows louder.
Desperate to determine what is real and what is not, Eve joins the search for an evil talisman stolen by Caldicott, and for which Caldicott's lover paid the ultimate price at the hand of Severn Barlow, a British earl who attempted to sway World War II.
Then Eve stumbles into a secret room and comes upon an old map with instructions on how to end the Earl's remote viewing and destructive spell-work.
But Severn has one more trick up his sleeve.