Alex is a curious child. Alex has been fascinated from a young age about many things, whether it’s about the echo that comes seemingly out of nowhere, the thunder that occurs in a night-time thunderstorm, or how sounds can travel through the air.
One day, when Alex learns that bats can fly safely through the night relying on sound alone, a passion is born.
Can we humans also use sound to move around? Mr. Stefan lives on Alex’s street, and he can! He uses a white cane that is equipped with a special device. This device, called a sonar device, helps Mr. Stefan move safely around town. 
Just before graduation, Alex accompanies Ina, an old kindergarten friend, to an all-day info house at a technical university. Students can receive training to enter many different professions there. Will Alex also find something there?

An accompanying text in the appendix provides background information and further suggestions for those who are reading the story aloud, and especially for parents and educators.