Janis Duke has spent a lifetime overshadowed by her domineering mother and ruthless twin sister. Always the quiet one-the forgotten one-she's played her role well. But when her younger sister marries the man Janis has secretly loved for years, something inside her snaps. Resentment turns to obsession. Desire twists into something far more dangerous. As resentment mounts and long-buried emotions ignite, Janis begins to taste the life she's always craved. But when the walls start closing in, she faces an impossible choice: walk away-or ensure he never belongs to anyone else. Dark, chilling, and utterly gripping, Heartquake will keep you questioning the line between love and madness.