SUZANNA AND MEGAN Atop the rocky coast of Maine sits the Towers, a magnificent family mansion that is home to a legend of long-lost love, hidden emeralds -- and four sisters determined to save their home against all odds.    New York Times bestselling author Nora Roberts brings you the Calhoun Women --     Suzanna's Surrender -- Burned-out and tired as hell, all ex-cop Holt Bradford wanted to do was relax. But when beautiful single mom Suzanna invaded his solitude to search for the missing Calhoun emeralds, he couldn't say no. Holt had changed from a bad-boy teen to a dangerously sexy man, but Suzanna couldn't risk her well-ordered life for a man who made her mouth go dry . . .    Megan's Mate -- Calhoun sister-in-law Megan O'Riley and her young son had traveled far to become the Towers' newest residents. Cool as an Atlantic breeze, Megan buried her passions and vowed never to let her heart control her life. But when boat captain Nate Fury set his course for her, the practical lady was swept away by his formidable charm.