The Fanged Crown

The Fanged Crown by Jenna Helland is the first novel in The Wilds series. "Tethyrian colonists sent to the jungle island of Chult have vanished and only their celebrated leader has returned. The story he tells of disease and monsters rings false to his enemies—a former mutineer is sent to discover what really happened to the Lost Colony, and what the Hero of Tethyr is hiding."