August or Forever by Ona Gritz
Ten-year-old Molly has always loved having a sister, but sisters are supposed to live together, right? Molly certainly thinks so. Unfortunately, her older half-sister Alison lives on a whole other continent. Their video chats are great, and Molly is thrilled when Alison’s hand-written letters arrive in the mail like surprise gifts. Still, it’s not enough, not compared to what other siblings have. That’s why when Molly finds out that Alison is finally coming to visit over the summer, she devises a plan she’s sure will get her sister to stay. But then Alison arrives with plans of her own, a fragile heart gets broken, and Molly stumbles upon a painful piece of her sister’s past. Molly has always loved having a sister, but this is the August when she’ll learn what it really means to be one.