First Printing Identifier: 1234567890 numberline on the copyright page.
Random House "Keyhole" Paperback Edition
First Printed: 1981
Cover Art: Robert Adragna
Internal Illustrations: None
ISBN: 0-394-84504-8
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.
Scholastic Book Services Paperback Edition
First Printed: January 1983
Cover Art: Charles Liese
Internal Illustrations: None
ISBN: 0-590-32503-5
First Printing Identifier: 12 11 10 9 8 7 6 5 4 3 2 1 numberline on the copyright page.
Knopf "Bullseye" Paperback Edition
First Printed: November 1992
Cover Art: Roger Loveless
Internal Illustrations: None
ISBN: 0-679-83259-9
First Printing Identifier: 10 9 8 7 6 5 4 3 2 1 numberline on the copyright page.
Notes: Alfred A. Knopf, Inc. is a subsidiary of Random House.
