You go down the path on the right, following the faint line in the dirt left by what you assume was the skeleton. You bike for about fifteen minutes without any sign of intelligent life. The line in the dirt does look more prominent, though, and you are almost sure this is the path the skeleton followed.
You pedal for another ten minutes, and just as you are about to give up and turn around, the road opens into a clearing. Instead of trees as far as the eye can see, the road ends at the mouth of a clearly abandoned mineshaft. A single oil lamp hangs at the entrance, illuminating it enough for you to see the cart tracks laid into the ground that lead deep into the mine. An old cart sits just outside the entrance, a surprisingly new-looking sign leaning against it that simply reads “Enter.” As you reach the end of the road, you see the skeleton again. It disappears just as quickly into the mine.

You slow to a stop and then struggle to keep from falling as your back tire bursts. A particularly sharp rock sticks out of the rubber and you mutter a few curses. Your bike is useless until you can get a new tire, and you are an hour away from any type of civilization.
You drop your bike and pull out your phone and curse again when you see that it has only ten percent battery. Of course, today of all days you forgot to charge it before going out.
The phone only has enough battery for one task: a call for help, or to use as a flashlight while exploring the mine.