Marguerite Caine's physicist parents are known for their groundbreaking achievements. Their most astonishing invention, called the Firebird, allows users to jump into multiple universes—and promises to revolutionize science forever. But then Marguerite's father is murdered, and the killer—her parent's handsome, enigmatic assistant Paul—escapes into another dimension before the law can touch him. Marguerite refuses to let the man who destroyed her family go free. So she races after Paul through different universes, always leaping into another version of herself. But she also meets alternate versions of the people she knows—including Paul, whose life entangles with hers in increasingly familiar ways. Before long she begins to question Paul's guilt—as well as her own heart. And soon she discovers the truth behind her father's death is far more sinister than she expected.

This vignette takes place about a week after A THOUSAND PIECES OF YOU ends, and after Marguerite has turned to her home universe. Definite spoilers for the book!

Ever since she used the Firebird, her parents' invention, to cross into alternate dimensions, Marguerite has caught the attention of enemies who will do anything to force her into helping them dominate the multiverse—even hurting the people she loves. She resists until her boyfriend, Paul, is attacked and his consciousness scattered across multiple dimensions. Marguerite has no choice but to search for each splinter of Paul’s soul. The hunt sends her racing through a war-torn San Francisco, the criminal underworld of New York City, and a glittering Paris where another Marguerite hides a shocking secret. Each world brings Marguerite one step closer to rescuing Paul. But with each trial she faces, she begins to question the destiny she thought they shared.

A million universes. A million dangers. One destiny. The fate of the multiverse rests in Marguerite Caine’s hands. Marguerite has been at the center of a cross-dimensional feud since she first traveled to another universe using her parents’ invention, the Firebird. Only now has she learned the true plans of the evil Triad Corporation—and that those plans could spell doom for dozens or hundreds of universes, each facing total annihilation. Paul Markov has always been at Marguerite’s side, but Triad’s last attack has left him a changed man—angry and shadowed by tragedy. He struggles to overcome the damage done to him, but despite Marguerite’s efforts to help, Paul may never be the same again. So it’s up to Marguerite alone to stop the destruction of the multiverse. Billions of lives are at stake. The risks have never been higher. And Triad has unleashed its ultimate weapon: another dimension’s Marguerite—wicked, psychologically twisted, and always one step ahead. In the conclusion to Claudia Gray’s Firebird trilogy, fate and family will be questioned, loves will be won and lost, and the multiverse will be forever changed. It’s a battle of the Marguerites…and only one can win.