Athelas never wanted housemates. Now he has three: the gumiho for whom he provided an alibi, the tea-wielding housekeeper who poisoned him, and the young human who might pose the greatest danger of all. All of Athelas's training tells him to kill small, soft things before something else does—or worse, before he grows fond of them and then something kills them. He should at least know better than to worry about the revenge-bent gumiho who is drawing the attention of every high-ranking Behindkind in Seoul Between. Hot on the tails of the gumiho who slaughtered her family, YeoWoo instead stumbles over the battered and broken body of a merman who knows just a little bit too much about her quarry. It should be simple to keep Marazul both alive and useful, but although YeoWoo is successful in the former, the latter is a different tail. YeoWoo has always taken what she wanted in blood and force. Athelas has always gained what he needed by deception and manipulation. With their usual methods failing at every turn and the investigation swiftly becoming deadly, it's time to make a few changes. Athelas has begun to fear that if he does change, his life will forever spin out of his control . . .