In this new adventure, Scout Moore--"the ranger of her own backyard"--travels with her brother, parents, and Grammy to Acadia National Park in Maine. When they arrive at the Hulls Cove Visitor Center, Grammy gives Scout Moore an envelope, inside of which is a scavenger hunt full of things they should see. Off they go to find Jordan Pond House, Thunder Hole, the tide pools at Otter Point, and other attractions, concluding with an early-morning hike up Cadillac Mountain to be the very first in America to watch the day's sunrise.