New York Times bestseller Brigid Kemmerer continues her thrilling series with more royal intrigue, sizzling romance, and shocking twists.

Tessa Cade has gone from masked outlaw to palace advisor, but even with her newfound power, she can’t stop the sickness still raging. And the kingdom’s supply of Moonflower elixir dwindles all the while. Prince Corrick is trying to find a new way to lead, but it isn’t easy to repair the rift between the royals and the people--or the one growing between himself and Tessa.

When an emissary from a neighboring kingdom arrives with an intriguing offer, Tessa and Corrick set out on an uncertain journey to find a new source of the lifesaving elixir. But with tensions brewing on deck and the sea swirling below, Tessa and Corrick must decide who they can trust--including each other. But they’re shocked to discover that a craven betrayal may be much closer than they think . . .