Poseidon’s Scar, published in January, is the second book in Matthew Phillion's YA fantasy Echo and the Sea series. The book is drenched in mythology and woven into imagination. Phillion has cast Echo, a fierce young woman who stands her ground, confronts conflict, and has the ability to breath under water, because she’s an Atlantean princess. The city of Yacuruna is inspired by the yacuruna of South American folklore: hairy, backward-facing river monsters. These creatures are said to live in upside-down cities beneath the water's surface. They shape-shift into beautiful people, in order to lure humans into the water. After learning of the tale, “this had to be in my book” Phillion explained. It was no easy task, however, pulling readers below the river's surface, along with the characters, to a wondrous, hidden city. “Writing an upside-down underwater world was tough,” he told Spine.