Best friends Cordelia and Larkin have always called the Glades-a peaceful swamp full of magical creatures-home. But when Oziris, Cordelia's father and the leader of their village, dies unexpectedly, a dark curse sweeps over the land.

The girls know that the curse must be tied to Oziris's death, and they're determined to break its hold on their home and bring Oziris back to life. Together, Cordelia, Larkin, and their two little brothers set off into the wild Glades in search of an elusive and enigmatic witch who is rumoured to have the power to reverse death. The Glades are no longer a familiar and friendly place, though, and danger lurks around every corner. But on their journey, the children discover that the most difficult challenge isn't wild marsh-maids or bogilisks or dragon-gators-it's the grief threatening to consume them.