There Will Be Blood is a 2007 American epic period drama film written and directed by Paul Thomas Anderson, loosely based on the 1927 novel Oil! by Upton Sinclair. It stars Daniel Day-Lewis, Paul Dano, Kevin J. O'Connor, Ciarán Hinds, and Dillon Freasier. The film follows silver miner-turned-oilman Daniel Plainview (Day-Lewis) as he embarks on a ruthless quest for wealth during the Californian oil boom in the late 19th and early 20th centuries.