The Bomb  (English, Paperback, Harris Frank)

But already when I thought of the trial I began to grow indignant, for strong as their case was I began to fear, and this was the heart of my fear. The police had already asserted that they had found bombs in Lingg's rooms. I knew Lingg well enough to know that that was almost certainly untrue; he would never have implicated Ida in his crime. From the description of the place, too, where he had been captured, I knew that he had been trapped in his little carpenter's workshop, and bombs would have been discovered there if anywhere.