Darkness has fallen on the lands of the sun as an army of misshapen fey spill out from beyond the Shadowline. At their head is Yasammez, dark creature of nightmare. A furtive bargain was struck at the gates of Southmarch and the castle was spared, but centuries of enmity will not be so easily appeased. Meanwhile Barrick, heir to Southmarch and cursed with madness, has crossed the Shadowline into the realm of his people's ancient enemy. There are stranger...

Emi can no longer hide within the safety of the shrines. The goddess has charged her with a new task, one that will take her deep into the perilous realm of yokai. Shiro is her guide and protector, yet his confusing, captivating allure is a danger of its own. With the fate of the world in her mortal hands, she cannot falter, but is she strong enough to sacrifice everything -- including him?

On Earth, a post-technological group of humans, pampered by servant machines and easy travel via "faxing," begins to question its beginnings. Meanwhile, a team of sentient and Shakespeare-quoting robots from Jupiter's lunar system embark on a mission to Mars to investigate an increase in dangerous quantum fluctuations.