Alexandra Ordolis played the character Shelly in a tv series based on a novel by what author?
Alexandra Ordolis: Alexandra Ordolis (born July 9, 1986) is a Canadian actress best known for playing Sister Delphine on the TV series Reign and playing Shelly in The Mist. The Mist (TV series):  It is based on the horror novella of the same name by author Stephen King.
Stephen King