Doing some more catching up, this is flagged as the second book from the author of International Bestseller, The Juror (which I haven't read).
From the Blurb:
When grifters Shaw and Romeo pull up at a convenience store in Georgia, their only thought is to fix a faulty tyre and be on their way to Florida.
But this happens to be the store from which a $318 million jackpot ticket has just been sold - and when the pretty clerk accidentally reveals the identity of the winning family, Shaw hatches a terrifyingly audacious plan.
Opening Lines:
Romeo was driving down from the Blue Ridge Mountain in the baffling twilight, going too fast, when a raccoon or possum ran in front of the car. The impact was disturbingly gentle. No thud - just a soft unzipping, beneath the chassis. Still, it tore at Romeo's heart. He braked and pulled over.