Blood and Roses

Fifteen year old Isla Mercier leads a completely normal life. She goes to Fort Memorial High School, has plenty of friends, and even has a boyfriend. One day at school, she receives a note in her locker, that reads:
'You have 32 days. Find me, your one true love, before I find you, and kill your entire family. For every day you don't find me, there will be blood.
Yours truly,
S.'
Using the clues given to her by her new stalker, she has only a short period of time before everyone she loves will be gone, and before 'S' murders her too.