Question: Which Irish actor played the main role in a screenplay based on British author E.J James' book as well as played serial killer Paul Spector?
Sentence (from "Fifty Shades of Grey (film)"): The film is based on the eponymous 2011 novel by British author E. L. James and stars Dakota Johnson as Anastasia Steele, a college graduate who begins a sadomasochistic relationship with young business magnate Christian Grey, played by Jamie Dornan.
Relevant evidence: Yes