The letters guided the girls through a scavenger hunt of small tasks—leave a coin on the third step, whistle under the tallest oak at dusk, press your ear to the old radio’s back—each action revealing a tiny artifact: a pressed flower, a scrap of music, a sketch of a map. With every piece they assembled a patchwork story of the craftsman’s childhood friendship with a traveling musician and a promise they’d keep: to make a string of ordinary days into something extraordinary.