He had approached the villa on that night of the storm not out of curiosity about the music but because of a danger to the piano player. The retreating army often left pencil mines within musical instruments. Returning owners opened up pianos and 

lost their hands. He followed the noise of the piano, rushing up the hill with Hardy, climbed over the stone wall and entered the villa. As long as there was no pause it meant the player would not lean forward and pull out the thin metal band to set the metronome going. 

Most pencil bombs were hidden in these—the easiest place to solder the thin layer of wire upright. He had paused by the French doors, leaned his head against the frame, then slid into the room and except for moments of lightning remained within the darkness. There was a girl standing, as if waiting for him, looking down at the keys she was playing. His eyes took in the room before they took her in, swept across it like a spray of radar. The metronome was ticking already, swaying innocently back and forth. There was no danger, no tiny wire. 

Beside his tent the antenna of a crystal set.