Gisella had a skip to her step as she and Werner walked down the stairs and out of the front doors of the Reichswehr Building to a waiting taxi. Once they were settled in the back seat, Werner gave her an askance look.

“Is where we’re going a surprise? Or can you tell me?” he asked.

She slid across the seat and squeezed her arm under his and gazed up at him with that innocent baby-face smile that he knew was far from innocent.

“First,” she said, “tel...