In a land ruled by water, treachery runs deep, and Daisy Thistledown's journey is just beginning.

Desperate to join the expedition searching for her mother and the other missing Botanists, Daisy and her friends abandon the safety of magical Mallowmarsh. Facing danger on the high seas, they find themselves pursued across the waves by ruthless Grim Reapers. But they will need help to defeat these dangerous enemies. Their greatest hope: to find the legendary Iffenwild, a mysterious city hidden beyond the sea and lost to time.

New discoveries await, and a strange botanical magic stirs beneath the waves. It will take all of Daisy's courage and determination--and the trust of an unexpected new friend--if she is to save the Greenwild from a terrible fate.