How (Not) to Soothe a Siren — Elizabeth A. Reeves

As summer turns its thoughts to fall and winter, Faerie is busy with preparations for what promises to be a harsh winter. When a mysterious mist begins to creep over the land, taking children as it goes, Cindy is forced to leave her friends and families behind, to confront whatever sort of sorcery this must be. No one is immune to the call of the Siren, even the Dark Lord.Cindy will have to fight for her family and her land. But, at what cost?