Midnight Spells by April Kelley

Cass’s new case involves a stolen book filled with dark magic spells. He must find it before the thief brings back the dead, literally. What he doesn’t expect is for his investigation to lead him into Riley’s classroom.

One taste of solving crimes and Riley is an addict. As much as Cass tells him not to get involved, Riley just can’t help himself. All he wants to do was talk to the witch in the yellow coat but that puts him directly in the path of danger.