The second Rosie and Fry decide to poke Roy with a stick in the rain, their quiet life on the island of Greensley is transformed into an adventure.

 But the problem with adventure stories, like the ones in Fry’s pirate books, is that they have twists and turns — the kind you only feel safe reading about with your nightlight firmly switched on.

Rosie doesn't mind walking her little brother home each afternoon. Sure, Fry stops along the way to make up stories about super-powered bull ants and heart-shaped rocks, but it's not like she really wants to hang around discussing hairstyles and boys with the other girls. When the pair meet Roy, a native Pelago who quickly becomes Fry's hero, they learn that the island of Greensley is built on a series of mysteries and half-truths that date all the way back to the very first pirates. 

What's more, there are people on Greensley who want to keep those stories hidden and will stop at nothing to bury Carmen's secret history. 

With Roy's help, Rosie and Fry head across the island to discover hermits who know more than they're letting on, runaway children, and not-quite-dead women. Do they really stand a chance against the most powerful man on the island? And what secrets is his impenetrable production plant hiding?