'Who are you?' asked the doctor. 'You are not the standard cruise passenger, I can tell you that.' 'Thank you,' said Phryne in a self-possessed manner. 'You are correct. I am a lot of things, some of which do not concern you, but mostly I am Phryne Fisher.'The nice men at P&O are worried. A succession of jewellery thefts from first class passengers is hardly the best advertisement for their cruise liners, particularly when it is likely that it is a passenger who is doing the stealing.Phryne Fisher, with her Lulu bob, green eyes, Cupid's bow lips and Chanel travelling suits, is exactly the sort of elegant sleuth to take on a ring of jewellery thieves aboard the high seas - or at least, aboard the SS Hinemoa on a luxury cruise to New Zealand. With the Maharani - the Great Queen of Sapphires - as the bait, Phryne rises magnificently to the challenge.There are shipboard romances, champagne cocktails, erotic photographers, jealous husbands, mickey finns, blackmail and attempted murder, all before the thieves find out - as have countless love-smitten men before them - that where the glamorous and intelligent Phryne is involved, resistance is futile.