Treasures book by Nora Roberts

"Secret Star" - Lieutenant Seth Buchanan's investigation was thrown into turmoil when Grace Fontaine turned up very much alive - and with one of the huge blue diamonds known as the Stars of Mithra. But Seth was finding it increasingly difficult to concentrate, with no mystery more compelling than Grace herself."Treasures Lost, Treasures Found" - Kate Hardesty had inherited a pile of mysterious notebooks, mapping the way to sunken treasure. Returning to the island where she grew up, Kate hired deep-sea diver Ky Silver - the man she'd left behind four years ago. But working with Ky meant more to Kate than any underwater riches...