You are the explorer. You journey to places no one has ever been and face dangers no one has ever known. Now you have a new assignment: Travel inside an injured scientist's brain to find the cure for a deadly plague. Up ahead the artery splits into two branches. You steer your capsule to the right. ""Stop,"" shouts Dr. Van Kamp. ""That's the way to the heart! We'll be smashed to bits!"" Do you trust him? The choice is up to you.