A new heart-pounding, suspenseful, and supremely romantic novel from New York Times bestseller Mia Sheridan.

She'd carried her boy made of moonlight in her heart all this time, the driving force that kept her searching, kept her looking for answers even when they seemed impossible to attain.

And he'd carried her with him as well.

Autumn Sterling knows more than she'd like to about pain and survival. As one of only a handful of children who made it to adulthood after being exposed to a horrific drug that swept impoverished communities decades earlier, Autumn is focused on living a full, rich life as a nurse.

And yet, she can't seem to let go of him: the boy she once called her moonlight monster. The boy they tried to convince her was merely a dream brought on by her medications. But how could he be anything but real when she touched him, felt him, made him laugh? When she woke with tangible signs of him still on her skin?

Years later, when Autumn spots that same moonlit hair on a busy city street, her new life turns upside down. The boy, now a man, has suffered on a level even Autumn can't imagine. And it is this anguished soul--Sam, her moonlight monster--who is the link to every question about her past that's ever haunted her.

As a murky picture of cruelty and corruption emerges, it's only Sam who can fully expose an evil too ghastly to comprehend...and it's only Autumn he'll let close enough to his dark and wounded heart to see the truth.