"Callie" (Carrie Coon) is a bit short of cash, so must retreat to her late father's dilapidated pile with her son "Trevor" (Finn Wolfhard) and geeky daughter "Phoebe" (Mckenna Grace). When the young girl discovers that she has a chess partner that she cannot see, then a "ghost trap" under their frequently shaking old house, she and her brother - alongside her seismologist teacher "Gary Grooberson" (Paul Rudd) are soon doing what it says on the tin. It takes for ever to get going, this film - far too much time is spent on character development and by the time it actually gets up to speed I was just a little bit bored. It is redeemed by the last ten minutes, to a certain extent, but I could have been doing with a bit more of Rudd's character - and quite a few more ghosts to bust. It looks ok, the effects are fine - there is just a paucity of them - and the two youngsters work well together with a decent (if wordy) script that has some amusing scientist jokes.