“A Million Worlds With You” is the last book in the “Firebird” trilogy by Claudia Gray that started with “A Thousand Pieces of You,” and continued with “Ten Thousand Skies Above You.” The trilogy ends just as beautifully as it began.

Marguerite is an artist who grew up in a family of scientists. She is the odd one out, but her family is wonderful and loving. Her parents are immersed in science, and Josie is an adventure-loving, brilliant older sister. Two of her parents’ graduate students, Theo and Paul, are practically part of the family.

Marguerite’s parents create a machine that allows the wearer to travel to different dimensions. Through a series of machinations, Marguerite ends up being able to travel to different universes without the side effects that bother others. In the first book, she is traveling to other universes to save her father. In the second book, she travels to other universes to save Paul, with whom she has fallen in love.

In the last book, Marguerite travels to different universes to save the universes. This book is filled with the passion, the danger, and the excitement that the other books have. Gray’s writing keeps the reader turning page after page to see what happens next. There is no break from the excitement — the excitement from the danger and the excitement from the romance. Much is uncertain as Marguerite travels, and Gray keeps the suspense tightly woven. Somehow, she manages to make the different Marguerites (in different universes) similar but different.

The story causes the reader to ponder what makes people who they are. If we, or those around us, had made different choices, would we still be who we are today? As Marguerite travels to different universes, she sees that a chance automobile accident, or other incidents, can deeply affect the lives of those involved. And the biggest question, the one Paul had believed — that love is fated — proves to have a different answer. Fate or free will? That’s one of the themes of the trilogy.

Marguerite alone cannot save the multiverses. It’s only when everyone works together that they have a chance to save billions of people.

Gray cleverly makes Marguerite an artist so that there is no question of her understanding the science involved in the Firebird mechanism. The scientific part of the story is a bit hazy, and that doesn’t hurt the story at all. There is plenty of passion and pathos in this well written, imaginative trilogy.

Please note: This review is based on the final hardcover book provided by the publisher HarperTeen for review purposes.