Dr Teesdale went back to his big arm-chair, still less inclined to read. He let his thoughts wander on for a while, without giving them definite direction, but ever and again his mind kept coming back to that strange little incident of the telephone. Often and often he had been rung up by some mistake, often and often he had been put on to the wrong number by the Exchange, but there was something in this very subdued ringing of the telephone bell, and the unintelligible whisperings at the other end that suggested a very curious train of reflection to his mind, and soon he found himself pacing up and down his room, with his thoughts eagerly feeding on a most unusual pasture.