Mystery of the Magic Circle

Random House Trade and GLB Hardbound Editions

First Printed: 1978

Cover Art: Jack Hearne

Internal Illustrations: Jack Hearne

ISBN's: Trade Ed. 0-394-83607-3; GLB 0-394-93607-8

Trade & GLB Edition First Printing Identifier: 1234567890 numberline on the copyright page.

Other Hardbound Trade Edition First Printing Traits:

- Glossy cover finish

- Plain white endpapers

- Back cover lists to "The Mystery of the Deadly Double"

Notes: Along with #24 and #28, this is one of the most difficult Hardbound Trade Edition titles to find. Still, it is not a rare book.

Random House First Paperback Edition

"Hitchcock Cover"

First Printed: 1981

Cover Art: Robert Adragna

Internal Illustrations: None

ISBN: 0-394-84490-4

First Printing Identifier: 1234567890 numberline on the copyright page.

Notes: As with all of The Three Investigators paperback titles printed in 1981, this book can be found with the Mystery Quiz/Bookmark page attached inside the front or back cover.

Random House Revised Paperback Edition

"Keyhole Cover"

First Printed: 1985

Cover Art: Robert Adragna

Internal Illustrations: None

ISBN: 0-394-86427-1

First Printing Identifier: 1234567890 numberline on the copyright page.