the last albert campion novel completed by margery allingham before she died, the plot set-up turns on a science fictional discovery or invention by school-children, and their coming to overly depend upon it.
manor books mmpb first printing though declared their second printing, which accounting includes the macfadden books mmpb first printing (1967)
cover art is signed, but i've not succeeded in deciphering it
cover price 95¢
224pp. including titles, indica, table-of-contents (chapters) etc, end pp.