Bricking in

one night, when i was home alone, i was suddenly woke by a loud noise. I jumped out of the bed. my heat was beating heavenly and the silent was deafening. I tried to find my phone but it was not there, creek! the door slowly opened, nothing. My heat beat further still "who's there! I shouted "click" came the reply it sound like a camera. I took a step back then click agin, this time closer" i call the police" i should more her said "ha ha " came the reply "it is me your sister" what happened next?