Seven-year-old Ellie loses the shiny red button from her favorite coat. That night, she goes to a secret underground world, the Lost Button Society, a hidden place where all lost buttons end up. Each button tells a story about the adventure it had before it was lost. With the help of a talking brass coat button named Sir Fastenwell, Ellie embarks on a whimsical journey to retrieve her red button before it disappears forever into the Great Button Archive . Along the way, she learns the power of storytelling, the value of little things, and how even lost things can have new purposes.