It's just 13 days to go until Halloween, so until then Ghost Hunter 1.1 is just 99p from Google's Play Store.

This is the ONLY spook hunting app that tracks anomalies through the real, physical space around you. Walk towards one and the distance decreases, turn to face it and the display swings around as it should. There's even a timed demo for you to test drive.

https://play.google.com/store/search?q=s......s&c=apps