In Flames (The Kestral Chronicles #1) by Nicole Northwood:
 
Seraphina didn’t come to Kestral Medical College for a soulmate, but fate seems to have other plans.

When her matchmaking ability unexpectedly bonds her to both of her captivating neighbors, Alexi and Dario, Sera is left navigating an unconventional match that is stronger than any connection she’s ever known.

Determined to prove their match is real, Sera begins digging for answers, only to uncover a secret buried beneath Kestral’s library that was never meant to surface. With the help of Alexi and Dario—along with the ghost of a long-dead student—Sera must soon decide how far she’s willing to go for the truth, even if it means risking her reputation… and her heart.

Content warnings can be found on Nicole Northwood's website.