Rampant (Killer Unicorns 01) by Diana Peterfreund Free Audiobook

Forget everything you ever knew about unicorns . . .

Real unicorns are venomous, man-eating monsters with huge fangs and
razor-sharp horns. Fortunately, they’ve been extinct for a hundred and
fifty years.

Or not.

Astrid had always scoffed at her eccentric mother’s stories about killer
unicorns. But when one of the monsters attacks her boyfriend – thereby
ruining any chance of him taking her to the prom – Astrid finds herself
headed to Rome to train as a unicorn hunter at the ancient cloisters
the hunters have used for centuries.

However, at the cloisters all is not what it seems. Outside, the unicorns
wait to attack. And within, Astrid faces other, unexpected threats:
from the crumbling, bone-covered walls that vibrate with a terrible
power to the hidden agendas of her fellow hunters to – perhaps most
dangerously of all – her growing attraction to a handsome art student
. . . an attraction that could jeopardize everything.