The diamond ring

"Engaged to be married, life should be blissful for Gustav and Serena. It should be a time of happiness; a time to plan their wedding and their future together. But the ghosts of Gustav's past have returned to haunt him, and one in particular casts a dangerous shadow over their relationship. Margot, Gustav's bitter and twisted ex-wife, is determined to destroy everything that Gustav holds dear. Starting with Serena..."--Publisher's description.