Claire Harper wraps up a hard day of work with a jog through Mulberry Park. Her workout is so much more than an effort to stay in shape. She runs to find a respite from the grief that has enveloped her since the death of her young son, but she never manages to alleviate the pain or the haunting memories of that fateful day . . . until she finds a little girl’s letter to God perched in a tree.

On impulse, Claire writes back, and the little girl’s letters gradually draw Claire into the companionship of other Mulberry Park regulars—all, in their own way, in need of comfort. As the strangers’ lives and hearts intersect and friendships grow, each discovers just how far and how high one simple letter can reach.