Throughout If I Stay, we followed Mia through her pain to make the decision over whether she should choose to stay alive...even though the rest of her family was gone... 
 At the end of the predecessor to Where She Went, Mia had to ask herself the same thing we asked ourselves... What happens next? 
 Told through Adam's eyes, we find out what's gone on since she chose to stay. 
 We are also reminded that while life goes on, it doesn't close doors so much as leave them cracked for us to peek back through when we are ready.