I have what may seem like a strange query. Many years ago - and I mean decades! - I read a novel about luxury French car manufacturers in the 1950s... it was very much about the personal lives of the bosses of the firms, probably more so than about the cars. I have been racking my brains but I cannot think of the title or author of the book.
Some clues:
(1) I don't think genuine names of the marques are given in the book, but it was clearly based on Delahaye/Delage/Talbot-Lago/Hotchkiss etc and the declining fortunes of the makers.
(2) The cover of the book was a colour drawing of a man, from the back, with an outstretched arm holding a car in the palm of his hand.
(3) I think the novel must have been written in the 1960s.
If anyone can identify this book from the info above I would be extremely grateful.