The good news is that thanks to trained aromatherapist
Feeling insufficiently traumatised, I went to the UPP to see Dark Water, which finished the job nicely. (It was more than just) take equal parts Fascination and Don't Look Now, put them in a nasty tower block, and add water. Bad water. Like in Ring, the problem is the ghosts that are soggy, smeary, sticky. That cling. Also like Ring, it has a sensible domestic message: fix drips before they get serious.