Sherlock Holmes: The new neighbour

Sherlock as finally arrived at 221B Baker Street, a residence located in London, (England) after solving a case overseas; he pays the cabbie and rushes out of the taxis cab and walks over to the door, reaches into his pocket and take out a key chain with his signature S.H on; it along with a single key. Sherlock tries the door nob on the door first and it was lock so he used the key that's already in his hand and open the door walking in along with the motion of the moving door. The first thing the detective notices was the sound of laughter, one of the voices belonging to the landlady name Mrs. Hudson and the other voice belongs to a man unknown to him. Sherlock silently closes the and head's up the staircase only to be stopped dead in his tracks when he heard the man's voice again. Not knowing who it is the detective curiosity got the better of him. Sherlock then hops down the stairs from where he was standing and walks towards the door close and rudely burst it open surprising Mrs. Hudson and the man sitting on the couch