the Mystery of 52

(quoted from blurb before title page) "This is a really front-rank mystery story by a writer who is fast winning an international name for his novels. 'Fifty-two weeks in the year, fifty-two cards in the pack' - and Number 52, the house of tragedy where on a wild night a fierce drama was staged to the undoing of Alfred Austin, a meek little clerk, whose fortune brought him no luck. Ten readers read this new story and none was able to solve the mystery of the semi-detached house which knew a 'double-life.' From the first ringing of the telephone bell to the wonderful denouement, the story holds the interest with incident after incident which seem to weave a still more tangled web for Superintendent Sinclair to unravel." NB the book title is given as "the Mystery of 52" on the front cover and spine, but as "the Mystery of Fifty-Two"on the Title page.