Imagine a drug that makes your brain function fantastically efficiently, tapping into your fundamental resources of intelligence and drive. Imagine a drug that lets you learn a foreign language in a day. Imagine a drug that makes you process information so fast you can see patterns in the stock market.Eddie Spinola's on such a drug. It's called MDT-48. It's a Viagra for the brain, a designer drug that's redesigning his life.But while the drug is helping Eddie make the sort of money he's only dreamed about, he's also beginning to suffer some ominous side effects. And when he tries to trace the other users, to find out how he can kick his addiction, he discovers a terrifying truth. Some of them are dying. And those that aren't are already dead . . .