Confused and distraught after the death of his father, a boy opens an envelope he left behind and is surprised to find a map of the woods beyond their house, with one spot marked in bright red. But why? The woods had been something they shared together, why would his father want him to go alone? Slowly, his mind settles as he sets off through the spaces he once explored with his dad, passing familiar beech and black oak trees, flitting Carolina wrens, and a garter snake they named Sal. When he reaches the spot marked on the map, he finds pages upon pages of drawings of woodland creatures, made by his father when he was his age. What he sees shows him a side of his dad he never knew, and something even deeper for them share together. His dad knew what he really needed was a walk in the woods.