There Will Be Blood is a 2007 American drama film written and directed by Paul Thomas Anderson. It stars Daniel Day-Lewis and Paul Dano. The film was inspired by Upton Sinclair's novel Oil! It tells the story of a silver miner-turned-oilman (Day-Lewis) on a ruthless quest for wealth during Southern California's oil boom of the late 19th and early 20th centuries. Kevin J. O'Connor, Ciarán Hinds, and Dillon Freasier are also featured in the film.