BLACKMAILED BY DIAMONDS, BOUND BY MARRIAGE: Harlequin comics

Angie's beloved sister fell to her death from the balcony of billionaire Nikos Kyriacou's mansion in Greece. Six months after the tragic incident, Nikos visits Angie to coldly tell her that her sister died with a valuable family heirloom of his, a diamond necklace... and he wants it back. Angie isn't like her sister, who loved living the high life—she's serious about her work and lives for archaeology. Angie is so mad at Nikos that she makes a bold proposal to make him suffer: in order to get the necklace back, he must marry her!