The mysteries collection.
Blyton, Enid.
Blyton, Enid.Mystery of the spiteful letters.
Blyton, Enid.Mystery of the missing necklace.
Blyton, Enid.Mystery of the hidden house.
London : Egmont,
2012, c2011.
The mystery of the spiteful letters. Originally published: 1946 -- The mystery of the missing necklace. Originally published: 1947 -- The mystery of the hidden house. Originally published: 1948.