The Guild of the Cowry Catchers, Book 4

A forbidden book. A pirate prince. An idea whose time has come.
Gerard and Silveo have made peace with their pasts...or so they think. They've joined the pirates they once hunted and are prepared to leave Wefrivain in quest for a new life. However, an unexpected cry for help brings them unwillingly back into home waters.
The fauns of Maijha Minor are in trouble, and helping them seems like the right thing to do. To succeed, they must circulate Gwain's forbidden book, which tells the truth about the wyvern gods. Gwain himself has already given up the task as hopeless, but Silveo has other ideas. Together, they will get into more trouble than anyone thought possible.