Book 1

The Mystery of the Green Ghost

by Robert Arthur, Alfred Hitchcock
4.0 (3)
Jul 12, 1985
English
Paperback (179 pages)

Book 2

3.0 (1)
Jan 1, 1966
English
Hardcover (158 pages)

Book 3

3 etsivää ja Aavejärven arvoitus

by William Arden, Inkeri Pitkänen
Jan 1, 1977
Finnish
Hardcover (165 pages)
4.0 (1)
Jul 12, 1973
English
Hardcover (148 pages)

Book 4

4.0 (1)
Jan 1, 1981
English
Hardcover

Book 5

The Secret of Terror Castle

by Robert Arthur, Alfred Hitchcock
Sep 12, 1964
English
Hardcover (179 pages)

Book 6

4.0 (1)
Aug 12, 1975
English
Hardcover (152 pages)

Book 7

Jan 3, 2016
English
Kindle (116 pages)

The Mystery of the Dancing Devil

by William Arden, Jack Hearne
4.0 (1)
Sep 12, 1976
English
Hardcover (141 pages)

Book 8

Aug 12, 1985
English
Paperback (143 pages)
Edition: Revised

Book 9

4.0 (1)
Oct 15, 1991
English
Paperback (192 pages)

Book 10

Jan 1, 1967
English
Hardcover (180 pages)

Book 11

O Mistério da Sombra que Ri

by William Arden, Carolina de Oliveira, Harry Kane
Feb 1, 1992
Portuguese
Paperback (188 pages)
3.5 (2)
Jan 1, 1969
English
Paperback (178 pages)
Jan 3, 2016
English
Kindle (118 pages)

Book 12

4.0 (1)
Apr 12, 1984
English
Paperback (144 pages)

Book 13

The Mystery of the Sinister Scarecrow

by M.V. Carey, Judy Winter
4.5 (2)
Oct 12, 1979
English
Hardcover (151 pages)

Book 14

Secret of the Haunted Mirror

by M.V. Carey, Roger Hall
3.5 (2)
Nov 1, 1975
English
Hardcover (160 pages)

Book 15

Jan 3, 2016
English
Kindle (168 pages)
4.0 (1)
Jan 1, 1973
English
Paperback (128 pages)

Book 16

4.0 (1)
Mar 12, 1985
English
Paperback (176 pages)

Book 17

4.0 (2)
Jun 13, 2000
English
Paperback (176 pages)

Book 18

3.5 (2)
Jan 1, 1978
English
Hardcover (185 pages)
Oct 10, 1965
English
Hardcover (185 pages)

Book 19

3 etsivää ja hopeinen hämähäkki

by Robert Arthur, Inkeri Pitkänen
Jan 1, 1983
Finnish
Paperback (151 pages)
4.0 (2)
Sep 12, 1985
English
Paperback (176 pages)

Book 20

Misterio del hombre de las cavernas

by M.V. Carey, C. Peraire del Molino
Jan 1, 1982
Spanish
Hardcover (176 pages)
3.5 (2)
Aug 12, 1982
English
Paperback (183 pages)

Book 21

Jan 3, 2016
English
Kindle (129 pages)
4.0 (1)
Dec 27, 1978
English
Paperback (115 pages)

Book 22

May 12, 1978
English
Paperback (153 pages)

Book 23

4.0 (1)
Sep 12, 1987
English
Paperback (182 pages)

Book 24

4.0 (1)
Jan 1, 1973
English
Hardcover (149 pages)
Dec 28, 2015
English
Kindle (118 pages)