Trade Edition First Printing Identifier: Lists to "The Mystery of the Laughing Shadow" on the back cover.
Other Trade Edition First Printing Traits:
- Matte cover finish
- Blue graveyard endpapers
- No ISBN
Notes: Sometimes "semi-glossy" cover hardbound copies of this title show up, they usually list to #16 or #20 on the back cover.
Random House First Paperback Edition
"Marchesi Cover"
First Printed: 1978
Cover Art: Stephen Marchesi
Internal Illustrations: Harry Kane
ISBN: 0-394-83775-4
First Printing Identifier: 1234567890 numberline on the copyright page.
Notes: There were 8 Printings of this title with the Marchesi Cover art in this edition printed between 1978 and 1981/82. With the 9th Printing, below, the new Adragna cover art was used.
"Hitchcock Cover" Paperback
First Printed: circa 1982 (9th Printing)
Cover Art: Robert Adragna
Internal Illustrations: Harry Kane
ISBN: Same as Marchesi Cover above
Earliest Printing Identifier: 90 numberline on the copyright page.
Scholastic Book Services Paperback Edition
First Printed: September 1979
Cover Art: Charles Liese
Internal Illustrations: None
ISBN: 0-590-30053-9
First Printing Identifier: 12 11 10 9 8 7 6 5 4 3 2 1 numberline on the copyright page.
Random House Revised Paperback Edition
"Keyhole Cover"
First Printed: 1985
Cover Art: Robert Adragna
Internal Illustrations: None
ISBN: 0-394-86412-3
First Printing Identifier: 1234567890 numberline on the copyright page.
Weekly Reader Children's Book Clubs Hardbound Edition
First Printed: circa 1989
Cover Art: Robert Adragna
Internal Illustrations: None
ISBN: Same as the Keyhole Paperback above.
First Printing Identifier: None
Notes: One of two Three Investigators books issued by Weekly Reader, the other being "The Mystery of the Whispering Mummy."
