Basically, I bought a house with my partner nearly 2 months ago now and the previous owner keeps coming back to "drop round" keys that she has mysteriously found. We know that she has tried the lock (we changed it the day we moved in) as our neighbours have witnessed her doing so. She has also tried banging on the door when she can't get in. I have a small 3 month old daughter and am looking for advice on what I should/can do? I feel that this woman is coming round too often when she no longer even lives within 15 minutes of my home.