PLEASE I NEED HELP SOMEONE SAVE ME!!

so im writing a story (will be a novel) through a boy named elis perspective and for one summer he and his six yr old sister florence go to alabama to live with their aunt and uncle.
so in town (the town is called Fanneryvilla, its fictional) he meets a uniquely odd and beautiful girl named Kassidy Tahooley and she has a sidekick named Louie Slugger. the three hang out together all summer and slowly Eli falls in love with Kassidy.
It starts getting sad in the end because Flo is a pain in the ezel and all plus Louie's parents have problems. Finally, the dag before school starts in town, Kassidy moves to Australia and everyones hart-, hart breaks.
Sorry im over explanatory. my problem is that i cant find a titel for the book. based on my summary can u help? it would mean THE WORLD to me!!!!