Cicely Disappears is a 1927 mystery novel by the British writer Anthony Cox, written under the pen name of A. Monmouth Platts.

Cox used a variety of pseudonyms during his career, in this case based on two properties he was associated with in Watford.

The newspaper held a competition with prizes for those who could give the best answers about the mystery.

One of the winners was Colonel Archie Christie, though the entry actually came from his wife, the celebrated crime writer Agatha.

[2] It was reissued in 2021 under the original name by British Library Publishing as part of a group of crime novels from the Golden Age of Detective Fiction.