Tomorrow I'll Miss You (Aloha Cove #3) by Theresa Kelly

Sixteen-year-old Cass Devan and her stepsister, Tabitha, have settled into their year at school. Cass is dating Logan and Tabitha is dating Micah. But letters in the mail soon change everything.

Tabitha receives letters from her mother, who has not been in contact with her since she deserted Tabitha when she was 4. Tabitha is torn between her allegiance to her father and the deep desire to know her mother better.

Cass struggles to maintain a close friendship with Janette from Tennessee, but her friend just seems to be drifting away. What will she do?

Both girls face hard decisions and family struggles as they look to God to lead them where He thinks best—and bring them safely home again.