chunk: Spud, Sick Boy, and Renton start using heroin again. Tommy, whose girlfriend dumped him after a chain of events initiated by Renton, begins using as well. One day the group's heroin-induced stupor is abruptly interrupted when Allison, their friend and fellow addict, discovers that her infant daughter Dawn has died from neglect without any of the group noticing. All are horrified, especially Sick Boy, who is implied to have secretly been Dawn's father.