London: Collins, (1964) dj. Hardcover first edition - "Over fire, through water. Press on, for right will prevail. . . These words, faded and almost illegible and an ancient key are found when Robert buys a bundle of old books for ninepence. They herald the beginning of a summer of mystery and excitement for the 'Quartet', a club formed by Robin, his two sisters, Ann and Fiona and his friend Hugh. THe answer to the puzzle lies somewhere in Farnleigh Manor, ancestral home of the Mourton family. But the manor is shut up and deserted. . . 156 pp. "