"What Happened to Goodbye" by Sarah Dessen

Did I buy this for $1 from my library's used book sale shelves on a whim?  I did.  Did I savor it for more than a week and wish it could have been longer?  I did.
McLean has been living with her dad ever since her parents' messy divorce a couple years ago.  Her mom has a new husband and twin toddlers to deal with, and McLean wants nothing to do with that.  Instead, she moves with her dad from town to town whenever his job as a restaurant rescuer requires him to move on.  Usually, when she arrives...