L.S.D. - a synthetic crystalline compound, lysergic acid diethylamide, that is a potent hallucinogenic drug. Ellie wasn't much of a people person besides Troy and Bea. They were her best friends. They partied together and did a lot of experimenting. Unfortunately, Troy was in college and away after summer. But while he was home he introduced Ellie to a few of his friends, and she grew quite fond of them.