Deep in a valley where the river runs silver and the fireflies never quite go out, a boy named Oswin discovers a mysterious jar that holds one perfect, unspent day — and must decide whether to save it forever or finally let it go. This gentle winter fable explores the bittersweet habit of waiting for the 'right moment,' and the quiet courage it takes to live in the one we already have. Snuggle in close — this one is warm all the way through.