Since the appearance in 1941 of Walter Farley's first book, "The Black Stallion," readers have been clamoring for more and more of his thrilling horse tales. ["The Black Stallion's Filly"] is certain to run nose to nose in popularity with its predecessors.

The black stallion's first daughter, Black Minx, pulls many a trick on her trainer and owner…. [In] the five months between her purchase and the Kentucky Derby, they succeed in changing her from a spoiled filly into [a] classic racer…. Derby Day finally arrives when "anything can happen." Something does happen which makes the book exciting reading right up to its very last period.