Twelve-year-old Elven has eleven fingers, no parents, and a skin tone that hints at murky origins. One day, she receives a wooden Puzzle Box belonging to her late mother, and an intriguing letter promising her love-if she solves it.

Thus begins Elven's long journey, in which she runs away to the town of Armora to find the Puzzle Box maker. There, she encounters its quirky residents and makes a new friend-the mysterious Madam Green who may not be what she seems. Ignoring signs of danger, Elven moves into Madam Green's cottage on Mount Armora where she helps rehabilitate the town's abandoned pets. Soon, their idyllic life is shattered with the arrival of miners intent on extracting gold from the mountain at all costs. Elven teams up with Madam Green to stop them, drawing both of them into a sinister scheme with tentacles deeper than anyone can imagine.

When the townsfolk accuse Madam Green of being a witch, it will take all of Elven's ingenuity to not just to unravel the shocking truth, but ultimately reveal the secret of the Puzzle Box.