#27 The Mystery of the Magic Circle

By M.V. (Mary Virginia) Carey, 1978
Random House hardbound 1978
Hitchcock Cover PB 1981
Keyhole Cover PB 1985
Back to the Original Series page.
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.