ISBN-13: 9781490465012 / Angielski / Miękka / 2013 / 240 str.
Ruby Halliday is surprised to find that her great-grandmother has left her a pearl necklace and a black cat in her Will. She is even more astonished to find that the cat can talk, and the ghost of her great-grandmother has appeared to help her.
For a blue ruby and two black pearls are missing from the necklace. Now Ruby must complete a desperate quest to find them, travelling under the sea and back in time.