Superheroes Gordon Blue and his brother Benny must rescue an opera star from the evil Dr. Screech before he turns her super high voice into a supersonic weapon.

BOK! BOK! Boom! 2014, Branches

ISBN-13: 9780545610636

Trade paperback

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BOK! BOK! Boom! 2014, Turtleback Books

ISBN-13: 9780606353571

Bound for Schools & Libraries edition

Hardcover

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