Julia Jones

The residents of a quiet English village begin to receive nasty, threatening letters. The wife of the local vicar calls in her friend Miss Marple to investigate. (imdb)

An adaptation of the children's fantasy novel by Jenny Nimmo. (Wikipedia)

Tom Long is staying with his Uncle and Aunt. When their grandfather clock strikes thirteen, Tom makes a strange discovery - a portal to the past where only a friendly girl called Hatty can see him. Adapted from a novel by Philippa Pearce. (imdb)