Frank and his older sister Caroline arrive by accident in the mythical Attic Town in Shadowland, where the Great Syndicate is ruling and robbing citizens. An army of Shadows kidnaps anyone who is out after dark and the Patrolling Thieves make the daylight miserable for everyone. Attic Town is a place where the streets have no names. Not realizing that they shifted in space and time, Frank and Caroline become separated as they look for directions to get back home. Wandering the streets, Frank meets Donlore, a young Patrolling Thief, and trusts the shadowy figure despite his first instincts. Caroline finds herself on a farm outside of town. She soon sets on a journey to find her younger brother and help him realize his mistake. She has to find him before dark. When the night falls, he will have joined the Dark Rulers forever and there will be no way back. In the meantime, the underground opposition of Attic Town begins to revolt.