Apartment 4B is supposed to belong to a quiet freelance architect.

Nathan Cross is polite, attentive, and always seems to appear in the stairwell just when you need a hand—or with an extra coffee he "accidentally" ordered. Yet for a man who supposedly lives and works alone, there are heavy footsteps above your ceiling at all hours, muffled voices behind his door, and sharp-eyed strangers coming and going almost daily.

Officially, Nathan Cross doesn't exist. Unofficially, he's an off-the-books operative running a covert mission right above your head—and his fascination with you started long before you ever met.

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AnyPOV • Slow-Burn Mystery & Romance • Secret Operative • Hidden Obsession