about seven o'clock
`` That is all right ; such a statement _ may _ do good , while I can not see that it is likely to do any harm , so we will prepare a conspicuous placard , worded to that effect , and will place it where it is certain that it will be found , '' remarked Sir Reginald , cheerfully . `` There is one point , however , upon which I should like a little enlightenment , Professor ; and that is as to the course you propose to pursue in order to obtain possession of Vasilovich 's person in this awe-inspiringly secret fashion . '' `` I do not anticipate much difficulty as to that , '' answered the professor . `` When I was in Saint Petersburg a year ago , Vasilovich held a post of responsibility at the War Office , and it was his habit to ride into Saint Petersburg from his chateau at Pargolovo in the morning , and out again at night , arriving home about seven o'clock , in time for dinner at eight . And I imagine we shall find that he does so still . The chateau stands in a park of considerable extent , and is approached by a drive nearly a mile and a half long , up which Vasilovich usually rides at a foot-pace . Now , at this time of the year , it will be quite dark in the park at seven o'clock , and nobody will then be likely to be out about the demesne .