“When this loyal French girl reached her home where German soldiers now were living, she began making lace and selling it from town to town. What was more important, she was finding friends to help her work as a spy. One was a scientist who could do strange things with chemicals, magnifying glasses, cameras and printing presses. Another was a map maker who in shorthand could write three thousand words with invisible ink on a piece of transparent paper so small Louise could paste it to a spectacle lens and carry it across the line that way.” “What for?” Tillie breathed. “So none of the German spies could read it,” Alice explained. “You see,” she went on, “things were happening over there that great French and English officers needed to know. And Louise could tell them. Once there was a terrible battle. Thousands of Germans were wounded. How many? Louise must find out. “There was a house close to the railroad track where all the cars filled with wounded soldiers were passing. Someone hid in the dark room. Every time a car passed, she’d tap on the floor, tap, tap, tap. In the next room, seeming to study her lessons, was a school girl.” “Just like you and me!” Tillie squeezed Peggy’s arm. “This school girl was making marks on paper,” Alice went on. “Four marks, then one across, four more and one across.” “Keeping track of the taps. I could do that.” Tillie was growing excited again. “When all the trains had passed,” Alice whispered, “Louise counted up all the marks. Then she multiplied that by the number of wounded men in each car, and so she knew how many thousands had been badly wounded. But how was she to get that number across the line?” “Paste it on her spectacle,” suggested Tillie. “Not this time, she didn’t,” Alice smiled. “She wrote it on a paper and hid it. You’d never guess where.” “In her shoe—in her glove—in her hair,” Tillie exploded. “Nope. None of these.” Alice shook her head. “Let me tell you all about it, then you may guess.” “Al—all right.” Tillie drew a long breath as she settled back. “You see,” said Alice, “Louise was going down a dark road in the night. In one hand she carried her bag of laces, in the other a lantern. It was a tin lantern. The tin was all full of holes. Inside a candle flickered. It didn’t give much light, just enough. Suddenly a gruff voice commanded: “‘Halt!’ “Louise was taken to a rough cabin where a short broad German spy woman lived. Everyone called her Le Grenouille, the frog. Louise and Charlotte feared and hated her. “‘Take off your clothes’, that’s what the Frog said to Louise. “Before obeying, Louise carefully blew out the candle in her lantern, then set it in the corner. “All her clothes were taken off. Everything was searched,—dress, stockings, shoes,—everything. Nothing was found. “‘All right. You may dress and be gone,’ said the Frog.