Alice, a novelist, meets Felix, who works in a warehouse, and asks him if he’d like to travel to Rome with her. In Dublin, her best friend, Eileen, is getting over a break-up and slips back into flirting with Simon, a man she has known since childhood. Alice, Felix, Eileen and Simon are still young, but life is catching up with them. They desire each other, they delude each other, they get together, they break apart. They have sex, they worry about sex, they worry about their friendships and the world in which they live. Are they standing in the last lighted room before the darkness, bearing witness to something? Will they find a way to believe in a beautiful world?

Connell and Marianne grew up in the same small town, but the similarities end there. At school, Connell is popular and well-liked, while Marianne is a loner. But when the two strike up a conversation --- awkward but electrifying --- something life-changing begins. A year later, they’re both studying at Trinity College in Dublin. Marianne has found her feet in a new social world, while Connell hangs at the sidelines, shy and uncertain. Throughout their years at university, Marianne and Connell circle one another, straying toward other people and possibilities but always magnetically, irresistibly drawn back together. And as she veers into self-destruction and he begins to search for meaning elsewhere, each must confront how far they are willing to go to save the other.

Frances is vaguely pursuing a career in writing while studying in Dublin. At a local poetry performance one night, she and her best friend, Bobbi, catch the eye of Melissa, a well-known photographer. As the girls are gradually drawn into Melissa's world, Frances is reluctantly impressed by the older woman's sophisticated home and tall, handsome husband, Nick. However amusing and ironic Frances and Nick’s flirtation seems at first, it gives way to a strange intimacy, and Frances’ friendship with Bobbi begins to fracture. Desperate to reconcile her inner life to the desires and vulnerabilities of her body, Frances' intellectual certainties begin to yield to something new: a painful and disorienting way of living from moment to moment.