Chapter 16: Return Address

Mara's photograph arrived with a question in capitals: DO YOU RECOGNIZE THIS? It showed a brass disc on a bare palm, green at the edges. Callum enlarged it on his laptop. The stamped number was still legible. CC 4 / 1187. A spare iron bar lay across the van's narrow table, taken from the side locker that afternoon. The original was in the grass at Lincoln Park with his toolbag, and he had not decided who would fetch either. The ghost leaned over his shoulder. His coat hung from her frame, the cuffs hiding her hands. It had gained an owner and lost most of its practical value in under an hour. "Your sleeve is on the keyboard," he said. "It is my sleeve." "It remains my keyboard." He moved the laptop. She followed, bringing the sleeve with her. A second photograph arrived. The back of the disc bore three…