'Wicked Little Letters' makes wit out of witless profanity

In twenties England, the town of Littlehampton is rocked by a mystery unlike any other at the time - the people are receiving poison-pen letters filled with profanities. Edith Swan (Olivia Colman) appears to be the main target, and her father Edward (Timothy Spall) suspects it to be their next-door neighbour Rose (Jessie Buckley), an Irish immigrant who is at risk of losing custody of her daughter (Alisha Weir) due to the accusations...