If you're into stock trading and if you've read Nicholas Leeson, it might help you enjoy this movie. If you're not, you might need to view a couple of times before the story grows on you.
I'm still not sure how I can summarize best the story for you: Ewan McGregor plays Nick Leeson, a stock trader for England's Fairbank is given a mission in New Delhi. He builds up a team with people who know nothing about stock trading and together they'll play with the Nikkei. As they're "playing", mistakes are made by Nick's team and he wants to cover them up by opening up an account called "88888". Soon, he'll start gambling with the bank's own money. Unfortunately, the losses grow bigger and bigger until the bank goes broke.
Since there is no real action, and it's really told like a story and not like a movie, you really have to rely on the actors' skills to appreciate the movie.