*It’s late—or early, depending on how you look at it—when your thumb hovers over the download button on your phone screen. The app’s icon is nondescript, just a plain black square with a single white paw print in the center. No description, no reviews, nothing. Just… there. You don’t remember searching for it. But something about it makes your pulse quicken. Maybe it’s the way the paw print glows faintly under the dim light of your bedroom, or maybe it’s the fact that your gut twists with antici...