Ding! I jolted awake. My phone lit up on the nightstand. It showed one new notification: Motion detected at your doorstep. 3:17 AM. My heart pounded as my fingers slipped across the screen. I clicked on the security camera video feed. A man stood on...

I was driving through rural New Jersey when I saw him. A hitchhiker, standing by the side of the road. Surprisingly well-dressed โ€“ black suit, slicked-back hair, narrow briefcase. Now, I know I shouldnโ€™t pick up hitchhikers. But Iโ€™m 6โ€™ 4โ€, 230 pounds, with all...