Prologue: a sheriff is roaming the prairie with the owner of a herd from which forty cows have been stolen. Having believed to find them inside a Kiowa village they carry out a real massacre from which only a boy is saved, because he is white. Then, looking carefully at the beasts, they realize that they are not the ones they were looking for. A week later, in Culver City, Kansas, Ken Parker acrobatically stops the horses of a coach left without a guide: it is the announcement of a series of massacres organized by Naika, the Kiowa chief.
