Kryket, you're asking for a spell so I would assume you are just starting out.. by the way, what are your grounds for doing such paranormal investigation? Do you have enough backgrounds for doing so? I would suggest, before doing such things, you should be well-versed first.. because here in my country, there are lots of self-proclaimed paranormal investigators.. going to a "spooky place" and investigating.. then declaring that there are spirits arounds that needs to be exorcised, then doing rituals in front of the public.. not considering scientific explanations on a specific area..
Paranormal investigation is not as easy as what others are thinking.. it is an investigation, so all the possible reasons should be considered- scientific and metaphysical, before declaring that it is really paranormal..
Good luck then..