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Limitless 
by Alan Glynn

Genre: Science Fiction

AKA - The Dark Fields A stunning international thriller and a wild, compulsive ride into the greedy vortex of modern life. Imagine a drug that made your brain function to its full potential. A drug that allowed you pick up a foreign language in a single day. A drug that helped you process information so fast you could see patterns in the stock market. Just as his life is fading into mediocrity, Eddie Spinola comes across such a pill: MDT-48 - a sort of Viagra for the brain. But while its benefits materialise quickly, so do certain unwelcome side-effects. And when Eddie decides to track down other users, he soon discovers that they're all dying, or already dead...