In the canals of Venice, hides a beautiful secret...

As princess of Venice, all Olivia knows is a life of privilege and wealth. But when the waters start to rise, flooding the streets and causing chaos, she realizes only her magic can prevent disaster befalling the city.

Desperate for help, and a friend, Olivia discovers something incredible - a water horse. Invisible to most, centuries old and possessing his own powerful magic, Lucian knows the deepest secrets of the sea - secrets that could hold the key to saving the city... If only their friendship can overcome those plotting against Olivia, and Venice itself.