Mystery of the 15 Sounds (Boys and Girls Books Series)

248 pp. Part of Goldsmith's Boys and Girls Books series, in the tradition of Tom Swift. From the jacket: 'When Roger's uncle offered him an opportunity to help in his scientific laboratory while the boy's parents were in Europe, Roger jumped at the chance. His uncle's laboratory - one of the most perfectly equipped - was the most fascinating place in the world. Even the latest scientific devices, however, could not keep out the 'Voice of Doom' which sounded hollowly through the laboratories in the dead of night, or prevent the ghostly antics of the phantom kangaroo and his ape-like companion. These and many other occurrences make The Mystery of the 15 Sounds one of the best boys' mystery stories of the year.'