Agatha Christie Peril in the End House

I have gone quite far into the game but now have a problem. In Lazurus' room it says to find a key. I used a hint on it and it shows me it is near the floor. I have clicked and clicked in that spot and can not pick up the key. Any suggestions? I cant go further until I can pick it up.
Thanks

Have you tried the edge of the rug or under it?