Grief lives in her bones. Love caught her off guard. The truth will destroy them both. Serenity's life has never been the same since her sister vanished without a trace. The grief is constant—quiet, sharp, and buried just deep enough for her to function. She keeps her head down, working through final papers, pretending to be okay… until Apollo crashes into her world. He's captivating. Beautiful. Dangerous in ways she doesn't yet understand. And he sees through every mask she wears. But Apollo isn't who he says he is. And neither are his friends. As Serenity falls deeper into a romance she can't walk away from, the past claws its way back—ripping apart everything she thought she knew. Secrets begin to surface. Lies unravel. And the truth behind her sister's disappearance is far worse than anything she could've imagined. How do you forgive the unforgivable? Cyanide is a hauntingly intimate dark romance about the weight of loss, the pain of betrayal, and the kind of love that blooms in all the wrong places. A story of innocence lost , toxic affection , and the slow, seductive burn of two people ruined long before they touched.