Formulaic but fun, Lowell's latest romantic suspense novel returns to the glamorous Donovan family she created in Amber Beach and Jade Island. When wheelchair-bound pearl harvester Len McGarry turns up dead on an Australian beach with an oyster shell sticking out of his chest, his beautiful widow, Hannah, knows that Len was murdered for his $3 million rainbow pearl necklace, the Black Trinity, now missing. Feeling herself in danger, Hannah seeks help from Len's partner and half-brother, the ruthless but hunky Archer Donovan. Archer fell for Hannah 10 years ago, when she was Len's teenage bride, and he's only too happy to help her track down both Len's killer and the necklace. Archer uses his family's resources, his inside knowledge of the pearl trade and his U.S. government connections to find the (rather predictable) bad guys. True love turns out to be harder to locate. As soon as they fall into bed, Archer knows he wants Hannah to have his baby. But Len was a cruel, unworthy husband, and Hannah, still recovering from her marriage, has trouble committing to Archer. Lowell uses the double search as backdrop for the push-and-pull between a reticent heroine and an oddly insistent, "elementally masculine" hero. Neither her plotting nor her airy prose take the romance genre anywhere new. Lowell does, however, infuse the minutiae of pearl diving and of international gem sales into a racy light read. (June) Copyright 1999 Cahners Business Information. -- PUBLISHERS WEEKLY.