My name is Sarah Lai. A decade ago I was on the cusp of being a big deal. Now, instead of working in Hollywood, I teach students about it. And these are the two most important lessons you need to know about the film industry: 1) Those with the money have all the power. 2) Those with the power get whatever they want. Ignore these rules and the whole system will crumble. Stick to the rules and you'll succeed. A thriller you won't be able to stop thinking about.