Deck of Scarlets by Amanda Sinatra

Eighteen-year-old Remi Watson had no intention of attending college after high school. In fact, she would rather work for her family’s business and run carefree in the streets of New York City than be a part of some cliché system. But when her Grams passes, her will states she will attend Columbia University—to keep the tradition alive.
Before her arrival, Remi receives an invitation in the mail from the Order of the Scarlet Quill, a society on campus that only invites elite candidates to accept. She soon discovers that the society is secret and trains demon hunters known as the Scarlets.
Remi will uncover more than just a secret society; she will soon discover her family has been involved from the very beginning.
But nothing surprises Remi more than her best friend’s boyfriend, Josh West, known as a Tutelary Saint and a guardian. Her guardian.
She will learn that demons are real, and the world is at risk of falling into the hands of an unknown, dangerous predator.
Deception, enemies, and forbidden lovers. Remi will need to learn how to navigate her new life to save the ones she loves.