The Crystal Crow

From Author Wars - https://authorwars.com/publications/the-crystal-crow-363895.html

Overview:

Title: The Crystal Crow
Author: Joan Aiken
Year: 1968
Publisher: Doubleday
Price: $4.95
Pages: 263
Binding: Hardcover
Type: Novel
Title Reference: The Crystal Crow
Notes:
• Clute/Grant typos the title as The Crystal Cow Price (front flap) and cover artist (back flap) from Archive.org copy.