ghosts on my new place, what should i do?

The ghost who lived in my last residence did things to bother me. She wasn't malevolent, but played pranks on me, doing things like hide money, crochet needles, car keys. Of course, our first instinct was not to blame or consider that the ghost did it. Usually, after tearing apart furniture and vacuum cleaner bags, when we were in a tizzy, one of us would yell at her to return what she had taken. And the missing object always turned up right where we had left it. She continued "haunting" the house after we had moved and it was vacant. My neighbor across the street called me many times in my new residence to tell me she saw lights on in the house, that someone was walking around. I had the police go to inspect, and they found nothing and told me the place was locked tight as a drum.