When Emma Chen catches her husband proposing to her younger sister at their son's sixth birthday party, she thinks her world has ended—but that's before she realizes they already knew her darkest secret. Diagnosed with stage 4 brain cancer and given months to live, Emma has hidden her illness from everyone, never imagining her own family was counting down her death. But the truth is even more sinister: Jason hasn't just been waiting for her to die—he's been poisoning her to speed it up. Trapped between her crumbling body and a family that wants her gone, Emma makes a desperate choice: instead of fading away quietly, she'll burn them all down and make sure her son survives what they've planned. In this emotional, twisty page-turner, a dying woman discovers that the most dangerous person in the room might be herself.