The mystery of the missing man. Originally published: London: Methuen, 1956
The mystery of the strange messages. Originally published: London: Methuen, 1957
The mystery of Banshee Towers. Originally published: London: Methuen, 1961.
The mysteries collection. Vol. 5 by Enid Blyton. ISBN 9781405267922. Published by Egmont in 2013. Publication and catalogue information, links to buy online and reader comments.