He got away from Mr Charrington and went down the stairs alone, so as not to let the old man see him reconnoitring the street before stepping out of the door. He had already made up his mind that after a suitable interval—a month, say—he would take the risk of visiting the shop again. It was perhaps not more dangerous than shirking an evening at the Centre. The serious piece of folly had been to come back here in the first place, after buying the diary and without knowing whether the proprietor of the shop could be trusted. However——!