The mysteries collection /
Blyton, Enid.
Blyton, Enid.Mystery of the spiteful letter.
Blyton, Enid.Mystery of the missing necklace.
Blyton, Enid.Mystery of the hidden house.
London : Dean,
2008.
The mystery of the spiteful letter. First published: Methuen, 1946  -- The mystery of the missing necklace. First published: Methuen, 1947 -- The mystery of the hidden house. First published: Methuen, 1948.