The way profound grief can become a path leading to belief in reincarnation and other supernatural phenomena forms the thematic tarmac for SXSW competitor Here Before. This wintery, unsettling drama, flecked with horror tropes in the tradition of Don't Look Now, Birth and other British-made meditations on loss, marks a distinctive and impressive debut for writer-director Stacey Gregg, who has worked mostly in British and Irish theater as well as writing episodes for TV shows such as Riviera.