"‘my dear mr. sherlock holmes,—lord backwater tells me that i may     place implicit reliance upon your judgment and discretion. i have     determined, therefore, to call upon you and to consult you in     reference to the very painful event which has occurred in     connection with my wedding. mr. lestrade, of scotland yard, is     acting already in the matter, but he assures me that he sees no     objection to your co-operation, and that he even thinks that it     might be of some assistance. i will call at four o’clock in the     afternoon, and, should you have any other engagement at that time,     i hope that you will postpone it, as this matter is of paramount     importance. yours faithfully,