“Maybe,” Amy murmured now to herself. She typed Monuments Men and Otto Hummel into the search engine. If the US Army was chasing stolen art, they must have known about Hummel.

A document popped up on Hummel’s death. His body had been found by a group of Monuments Men as the war was ending. He had been shot and was still sitting in a gilt chair in the ballroom of Neuschwanstein Castle, the famous site built by King Ludwig II of Bavaria, often called the Mad King.

The Monuments Men had been acting on information from one American spy, code name Sparrow, who had traced thousands of artworks looted from Jewish families all over Europe to Neuschwanstein Castle.

Amy read through a record of a soldier who had served there. “We had a strong suspicion that Sparrow had killed Hummel,” he said.

Amy rubbed her forehead. Everything was jumbled together in her head. Spies and stolen art, Nazis, heroes, victims. A medieval map. How was it all connected? Was it connected at all?

She just knew the answer was here.

She contacted Attleboro again. Ian answered.

“Can you help me out with some research?” she asked. “I need to know the identity of a spy at the end of the war called Sparrow. He might lead us to Jane.”

“You know,” Ian said. “That’s a funny coincidence… .”

“What?”

“Sparrow is Sperling in German,” Ian said.

“Of course!” Amy sat up. “It’s Jane! It’s got to be! We need confirmation.”

“I’m on it,” Ian said.

Amy checked her watch. Where was Dan? He’d been gone for way over an hour. Just as she had the thought, he walked in.

She examined him briefly as he tossed his backpack on the floor. That mask was there. He had gone deep inside himself. Whenever she saw it, it chilled her. It was like she had lost her brother.