What conclusion does Holmes after listening to the details from Mr.Munro?

Holmes believes that Mrs. Munro is being blackmailed, and that she lied about her first husband being dead.

This woman was married in America. Her husband developed some hateful qualities; or shall we say that he contracted some loathsome disease, and became a leper or an imbecile? She flies from him at last, returns to England, changes her name, and starts her life, as she thinks, afresh. She has been married three years, and believes that her position is quite secure, having shown her husband the death certificate of some man whose name she has assumed, when suddenly her whereabouts is discovered by her first husband; or, we may suppose, by some unscrupulous woman who has attached herself to the invalid. They write to the wife, and threaten to come and expose her. She asks for a hundred pounds, and endeavors to buy them off. They come in spite of it, and when the husband mentions casually to the wife that there are new-comers in the cottage, she knows in some way that they are her pursuers. She waits until her husband is asleep, and then she rushes down to endeavor to persuade them to leave her in peace. Having no success, she goes again next morning, and her husband meets her, as he has told us, as she comes out. She promises him then not to go there again, but two days afterwards the hope of getting rid of those dreadful neighbors was too strong for her, and she made another attempt, taking down with her the photograph which had probably been demanded from her. In the midst of this interview the maid rushed in to say that the master had come home, on which the wife, knowing that he would come straight down to the cottage, hurried the inmates out at the back door, into the grove of fir-trees, probably, which was mentioned as standing near. In this way he found the place deserted. I shall be very much surprised, however, if it still so when he reconnoitres it this evening. What do you think of my theory?”