This is an ensemble of four apparently complete erotic novels: The Instuments of the Passion (Anonymous); Misfortunes of Mary (Anonymous); White Stains (Anaid Nin); and Innocence (Harriet Daimler). The collection performs a useful service in putting into print these novels, that are (generally speaking) hard to find, although use of the word ‘Lost’ in the title seems to be something of an overstatement. I own, or have traced, other editions of the four works. The first work was published by Masquerade under the authorship of Alizarin Lake, and the second may be the same as that listed by Amazon as a work of 'Arnold Kem'. The other two are even better known. That said, it is a useful collection. ‘Instruments’ is a lengthy novel, detailing the progress of a young woman into extreme submission, treating its subject with a rather broader erotic appeal than ‘L’Histoire d’O’. ‘Mary’ seems to be a Victorian/Edwardian tale of the corruption of another female innocent, and these are the two works likely to be less familiar to devotees of this genre. A ‘useful’ book, therefore, if you lack other editions of the four works, but here, as much as anywhere in the genre, you have to be aware that the definition of ‘anonymous’ can sometimes be rather flexible. ( )