"Let me think. My circle of acquaintance is large, but I cannot recall anyone claiming H. C. as his monogram. My memory may not serve me correctly, though."
"Perhaps your card-receiver may do better, Mr. Lawrence. Will you examine that and let me know?"
"Certainly. Suppose you accompany me, and let us find out at once? I do not feel disposed to let this vexing matter rest."
"With pleasure, as I have a leisure hour at my disposal."
They returned to the house together and entered at once upon their quest.
It was not long before their labors were rewarded with success The detective looked up with a small square of pasteboard in his hand, from which he read aloud triumphantly.
"Harold Colville!"
"'H. C.' Harold Colville!" exclaimed the banker. "Why, really I had forgotten Mr. Colville."
"He visits here then, of course," said the detective.
"He did—at one time—frequently. Latterly he has discontinued his visits. Indeed, it has been four or five months since he called upon us."