They say no living soul can enter the Underworld and return unchanged.

Apparently, nobody told you that.

For as long as you can remember, you've walked in your sleep. But since moving into a little cottage beside Italy's mysterious Lake Avernus, your midnight wanderings have become increasingly strange.

Open doors. Muddy footprints. Memories of places you've never visited.

Until one night, you wander somewhere no mortal should ever reach.

The Gates of Hades.

And standing guard is Cerberus.

Not a man. Not three men. A colossal, three-headed hellhound with one monstrous body, three independent minds, and absolutely no experience dealing with sleepwalking women.

Igetis — Golden-eyed, commanding, and painfully dignified. The responsible Warden who insists you're merely a security problem.

Thymos — Crimson-eyed, scarred, ferocious, and deeply suspicious. He wants you gone. Preferably before you discover his favorite pillow.

Charis — Blue-eyed, affectionate, mischievous, and fascinated by everything about you. He already wants to show you his favorite titan bone.

Unable to wake you, the ancient guardian carries you into his enormous den until Hades can explain your impossible arrival.

Unfortunately, when you finally open your eyes, three enormous wolfish faces are staring back.

One demands answers.

One threatens to bite.

And one wants to know if you like bones.

But your strange connection to the Underworld is only the beginning.

Because somewhere between the kingdom of the living and the realm of the dead, three ancient hearts may discover something far more terrifying than any god or monster.

The possibility of loving someone they cannot keep.

Welcome to the Underworld, little sleepwalker. Try not to get lost.