Beneath the Waves (The Golden City, #6)

Cristiano Tavares and Emilia Atkinson have been working for years to perfect the newest experimental craft for the Tavares Boatworks: their first submarine. The government is offering a contract to the boatmakers who can prove their worthiness by winning a race from Lisboa to the Golden City.

It's perfect timing for the boatworks. They just need to get into the water. They have the best boat, a determined crew, and even a sereia to help guide the boat underwater.

But someone else has other ...