When mathematician Aubrey MacLean suddenly loses the job she’s poured her soul into, she has no choice but to quit New York and regroup in her rural Indiana hometown. She never wanted to return and it’s a good thing her stay is temporary—Nick, the boy who broke her heart in high school, has a picture-perfect life, and Aubrey’s not interested in front-row seats to everything she missed out on.   Every day, Nick Thacker exhausts himself at the steel mill, buys a better life for his daughter one paycheck at a time, and pours his many regrets into crafting love letters for other people. All is well—or at least tolerable—until the girl he lost eighteen years ago crash-lands back in Indiana, tearing his carefully crafted composure to shreds.   Intent on regaining her dream job, Aubrey keeps her head down, avoids Nick, and works to restore her professional reputation. But when an old friend begins sending letters that breathe n