There were three distinct stages in the evolution of Annette Brougham's attitude towards the knocking in the room above. In the beginning it had been merely a vague discomfort. Absorbed in the composition of her waltz, she had heard it almost subconsciously. The second stage set in when it became a physical pain like red-hot pincers wrenching her mind from her music. Finally, with a thrill in indignation, she knew it for what it was - an insult. The unseen brute disliked her playing, and was intimating his views with a boot-heel.