Thirteen year old Jo Harper's trip to attend the reading of her mysterious uncle's will isn't welcome news to everybody in Willowby, Wyoming, and with the notorious Casper Brothers on the loose, the spring of 1911 isn't the best time to steam across the wide open west. But with great expectations and grim determination, Jo hurtles into adventure, learning along the way who her friends are, and who wants her out of the way for good. Blossoming danger! Dark captivity! And wildflowers galore!