I loved The Otherwhere Post!  It’s set in a universe with parallel worlds inspired by historical Scotland.  When the doors to other worlds closed during a fatal disaster caused by Maeve’s father, it became impossible to travel between them, forming a backlog of letters with nowhere to go.  Years later, orphaned Maeve never stays in one place for long—everyone curses her father’s name—but when she receives a years-old anonymous letter claiming his innocence, she must find out who it’s from.  At the Otherwhere Post, she meets a boy who can help her, though he has just as many secrets as her own.  This lush story is full of danger, intrigue, and romance—I’m going to be dreaming about it for a while.