Ethel Lina White 
She Faded into Air [EPUB ebook] 

At four o’clock on a misty October afternoon in London, Evelyn Cross, blonde, nineteen and fashionably dressed, vanishes into thin air. Evelyn is the daughter of wealthy Raphael Cross. She has been seen going into the flat of Madame Goya, a fortune teller in Mayfair, but in response to Mr Cross’s distracted enquiries, Madame Goya swears that his daughter never entered her flat. Then another millionaire’s daughter goes missing in the same block of flats, and Cross decides to employ the services of Alan Foam, Private Investigator.But if Foam thinks this is a straightforward case of find the victim, he’ll need to think again …