One| Riley

She's put a time limit on herself, on her life.
She's given herself 30 days, but those 30 days aren't there to try and change her mind, those 30 days are there to slowly say all of her goodbyes, to put things in place so that her exit isn't harmful for her friends and family

But when he finds the book full of some of her goodbye letters, he'll use all of her 30 days to change her mind