Tress lives on a small island in the Emerald Sea — a sea of emerald-colored spores rather than water, where a single drop of rain causes the spores to sprout deadly vines in seconds. Her life is a simple one of washing windows and collecting cups brought home by sailors, until the duke takes his son Charlie — the boy she loves — away on a voyage to find him a suitable bride. When disaster strikes and Charlie falls into the hands of the Sorceress of the deadly Midnight Sea, Tress does what no one from her island has ever done: she stows away on a passing ship and goes to sea, and finds herself among the pirate crew of the Crow's Song. Narrated with warmth and wit by Hoid — the wandering enigma known across the Cosmere — Tress of the Emerald Sea is a swashbuckling adventure described by its author as his love letter to readers who cherished The Princess Bride. Originally written as a gift for Sanderson's wife Emily and released through the 2022 Kickstarter that raised $41.7 million (the largest Kickstarter of its time), it was published in 2023 as Secret Project 1.