From her attic in the Arizona mountains, thirty-four-year-old Myra Malone blogs about a dollhouse mansion that captivates thousands of readers worldwide. Myra's stories have created legions of fans who breathlessly await every blog post, trade photographs of Mansion-modeled rooms, and swap theories about the enigmatic and reclusive author. Myra herself is tethered to the Mansion by mysteries she can't understand--rooms that appear and disappear overnight, music that plays in its corridors.

Across the country, Alex Rakes, the scion of a custom furniture business, encounters two Mansion fans trying to recreate a room. The pair show him the Minuscule Mansion, and Alex is shocked to recognize a reflection of his own life mirrored back to him in minute scale. The room is his own bedroom, and the Mansion is his family's home, handed down from the grandmother who disappeared mysteriously when Alex was a child. Searching for answers, Alex begins corresponding with Myra. Together, the two unwind the lonely paths of their twin worlds--big and small--and trace the stories that entwine them, setting the stage for a meeting rooted in loss, but defined by love.