Here's the synopsis for Locke from the Hollywood Reporter:
Locke tells the story of one man's life unraveling in a tension-fuelled, 90-minute race against time (Knight will shoot in real time over 90 minutes). Ivan Locke has the perfect family, his dream job, and tomorrow should be the crowning moment of his career. But one phone call will force him to make a decision that will put it all on the line.
Locke is directed by Steven Knight who is yet to prove his talent in direction in the Jason Stathan action thriller Hummingbird.