Tetteh and the Lightning Stone. Tales from Ghana, #2

When eight-year-old Tetteh finds a glowing stone after a thunderstorm, he thinks it's just a cool treasure. But the stone hums like a heartbeat and flashes with light whenever he gets angry. Soon, goats start floating, and rain clouds gather over his farm. Tetteh discovers that the stone once belonged to Nyankonhene, the Sky God's messenger  and now the sky want it back. To save his family's farm, Tetteh must climb the highest hill before sunset and return the stone to the storm.
But the journey is full of surprises.