"Children with autism approach events and objects in an unusual way. With these characteristics, they realize what ordinary people cannot even imagine."

Hans Asperger

One of the most harmless people in the world is about to become the most dangerous.
Harmony House is more than a club for special people.

Sages with autism use their extraordinary talents for the benefit of society.
Among them, Eddie Parks stands out. He has Asperger's syndrome, at the high-functioning end of the autism spectrum.

Expectations are high for Eddie, all eyes are on him, but his only goal is to hear the voice of the mother he has never seen.

His invention, the Echo Box, utilizes acoustic archaeology, recreating previously unrecorded sounds.

But this unique technology is about to become a major threat to national security.
Harmony House is on the brink of destruction. Dr. Skylar Drummond will protect Eddie no matter what.

He risked everything not to be silenced. Because the echo of that voice is about to change both the future and the past.

Eric Bernt combines sound waves with special brains in an extraordinary adventure. Sound Speed is a breathless novel with perfect harmony!