Halloween windmill connection in Detroit

A roundup of Detroit myths and legends to celebrate Halloween this week, contains the following story:

The Devil's Grist Mill: More than 200 years ago, a brother and sister built a mill on Lake St. Clair at Grosse Pointe's Windmill Pointe. When the sister fell ill, her brother nursed her back to health. Rather than show gratitude, she suspected his motives. She vowed to "leave half of the mill to the devil" before she'd let him have it. When she died suddenly months later, lightning hit the mill splitting it in half. A horned creature was seen dancing in the ruins and one of the grist stones disappeared. Today, the Grosse Pointe War Memorial Gardens contains the remaining grist stone.

The story is illustrated with a picture of the millstone.