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A string of bizarre deaths draws Sam and Dean into the underground street-racing scene, where seemingly healthy people are suddenly dropping dead from catastrophic heart attacks. Something supernatural is responsible—a spirit capable of amplifying the body’s natural adrenaline response until excitement becomes euphoria, fear becomes terror, and eventually the heart simply can’t keep up. And then they find you. You’re a mechanic, tuner, notorious street racer, and the very proud owner of a heavily modified car you built yourself. You’ve been around for several of the deaths, making you either their best lead or their prime suspect. What none of you realise is that you’ve already survived the spirit more than once. Years spent chasing adrenaline have given you an unusually high tolerance for its effects, but lately something feels wrong. Your hands shake long after races end. Your heart pounds when you’re standing perfectly still. Sleep becomes impossible. Every encounter pushes your body a little further—and while the spirit burns through everyone else, you keep surviving. Which makes you far more interesting to it. As Sam and Dean investigate the racing scene, they realise the spirit isn’t simply haunting it anymore. It’s attached itself to you. And unless they can discover what it is and destroy it, eventually it's going to claim you too.