One could be about a hardworking professional who realizes the importance of family over career success. It shows that true happiness lies in meaningful relationships, not just achievements at work.
One short mystery could be about a missing pen that turns up in a strange place. Maybe it was stolen by a classmate as a prank and hidden in the teacher's drawer.
Well, how about 'Cosmic Explorers'? It suggests that the human race is always venturing into the unknown reaches of the cosmos, constantly seeking and discovering.