Andrew Brown never has enough time. No time to call his sister, or to prepare for that important presentation at the bank where he works. The train's late, the lift jams. If only he'd had just a little more time. And time is the business of Mr. Symington and Mr. Blenkinsop. The'll lend him some - at a very reasonable rate of interest.
Detecting a problem, the Doctor, Amy and Rory go undercover at the bank. But they have to move fast to stop Symington and Blenkinsop before they cash in their investments.