Sister Pie (Facebook photo)
A pie must have good crust.
Of Sister Pie's crust, Eater Detroit writes:
"Just perfectly crisp and flaky not-too-sweet pastry that lets the rest of the ingredients shine."
The local food site lists nine "must-eat pies" in the Detroit area, including these:

Sweet Potato Sensations (Faceboook photo)
- Sister Pie: 8066 Kercheval St., Detroit
- Love’s Custard Pie: 2934 Russell St., Detroit (Eastern Market Vendor)
- Sweet Potato Sensations: 17377 Lahser Rd., Detroit
- Rock City Eatery: 4216 Woodward Ave., Detroit
- Ackroyd's Scottish Bakery: 25566 Five Mile Road, Redford Township
The full list is here.
Read more:
Eater Detroit