Speculation / Nisi Shawl.

Enhanced descriptions from Syndetics:

A wonderful middle-grade fantasy debut about Black families, family history, family curses ... and a really marvelous pair of spectacles.

After Winna's little sister breaks her glasses, her grandfather gives her an old-timey pair of spectacles that belonged to her great-aunt Estelle. The specs are silver and perfectly circular, with tiny stars on the bridge and earpieces that curl all the way around her ears.

Best of all, they're magic .

Because when Winna makes a wish beginning with the words "What if"--that is, when she speculates--the spectacles grant it. Winna wishes she could see ghosts ... and soon she meets not only the real Estelle, but Estelle's mother, Winona. Nearly a century before, Winona escaped from slavery and ran north with her baby, Key. But Key was stolen from her under mysterious circumstances, and now Estelle and Winona have a mission for Winna: Find Key .

He's still alive. He doesn't know the whole truth. And unless Winna can solve the mystery and bring him home, a powerful curse called the Burden will smother out their family's lives--and Winna's mom could be its next victim.

This beautifully written historical fantasy by an award-winning science fiction author offers new twists and turns in every chapter and will leave you looking at your own family's roots with new eyes.