Anthony Gilbert 
The Man Who Wasn’t There [EPUB ebook] 

An actress, a politician – and a murder by poison where no one is above suspicion. Classic crime fiction from one of the greats of the era. Marjorie Hyde, a gifted but unsuccessful actress, is happily married. Like many members of her profession she is temperamental, and though not that beautiful has that Titian colouring that is supposed to make men mad. Her husband, Christopher, is insanely jealous, and after learning that she is frequently in the company of Philip Clare, a barrister and Parliamentary candidate, Christopher threatens to instigate divorce proceedings that would ruin his rival’s career. The same night, he drinks his usual glass of after-dinner port and dies from hyosin poisoning. And in the unravelling of the mystery surrounding his death, nobody is free from suspicion.