Otter survives by his wits and shapeshifting magic. So after enduring a bitter winter on the shores of an unfamiliar sea, he hunts for the source of the blight plaguing his homeland. But when something ancient and deadly stirs within the dark waters, he fears his power can’t match the threat.

Calling on the creatures he’s befriended for help, the determined young shifter descends into the dangers of the abyss. When he inadvertently rouses a horror from the ancient past, it tears into his allies with murderous intent.

Can Otter’s skill and compassion unravel the mystery, before the last acts of a long-dead people poison everything he loves?