three o’clock
There was , for instance , the matter of the back door to the Wells house . Nothing was more unlikely than that the key would still be hanging there . I must , therefore , get a key . At three o'clock I sent the office-boy out for a back-door key . He looked so surprised that I explained that we had lost our key , and that I required an assortment of keys of all sizes . `` What sort of key ? '' he demanded , eyeing me , with his feet apart .