Serena’s Review: “A Theory in Dreaming”

This post may contain affiliate links for books we recommend.  Read the full disclosure here.

Book: “A Theory in Dreaming” by Ava Reid

Publishing Info: HarperTeen, July 2025

Where Did I Get this Book: Edelweiss+

Where Can You Get this Book: WorldCat.org | Amazon | IndieBound

Book Description: All stories come to an end.

Effy learned that when she defeated the Fairy King. Even though she may never know exactly what happened at Hiraeth, she is free of her nightmares and is able to pen a thesis with Preston on the beloved national fairy tale Angharad. She has finally earned a spot at the literature college, making her the first woman in history to enroll.

But some dreams are dangerous, especially when they come true. The entire university—and soon the entire nation—is waiting for her to fail. With the Fairy King defeated and Myrddin’s legacy exposed, Effy can no longer escape into fantasy. Who is she without her stories?

With Effy under threat, Preston is surprised to discover a rage simmering inside him, ringing in his ears like bells. He begins to dream of a palace under the sea, a world where he is king—visions that start to follow him even in waking.

As the war between Llyr and Argant explodes, Effy and Preston find themselves caught in the crossfire: Effy losing her dreams and Preston losing himself in his.

Are dreams ever truly just dreams?

Previously Reviewed: “A Study in Drowning”

Review: I loved “A Study in Drowning.” It felt like such a tightly plotted YA title that incorporated a strong personal arc for the main character, Effy, as well as a tension-filled gothic mystery that built to an incredible climax at the end. As you can expect from this, it was a fantastic stand-alone read. That said, while I was satisfied with its ending, I was more than happy to return to this world and these characters. Especially to see more of the burgeoning love story between Effy and Preston.

Unfortunately, this one didn’t live up to the highs of the first book, mostly because of how perfectly insulated that story felt. But there was still much to enjoy here, so let’s start with that first. Per Reid’s typical style, many of the themes explored within this story are dark but important. Through careful crafting, the author explores the slow descent into isolation and withdrawal that can come with serious depression. Both Effy and Preston also constantly struggle to find a place for themselves in an institution and society that is built for others, Effy as a woman in the man’s world of academia, and Preston as a man of two heritages, both of which are at war with one another. These themes were richly detailed, and while it didn’t necessarily make for a “fun” reading experience, I definitely felt like I was getting a stark window into the struggles of these two characters and others like them.

That last point speaks to one of my struggles with this book, however. While well-represented and thoroughly explored, the reading experience itself quickly began to feel heavy and almost tiring; I found myself needing to put the book down after only short reading sessions. Part of this, I think, comes down to the fact that both Effy and Preston’s inner arcs are fairly similar. They are each dealing with similar feelings of isolation and like they are outsiders intruding where they are not welcome. This then leads to a lot of inner dynamics centered around feelings of weariness and fear. So, while the book does alternate between their perspectives, much of the story felt the same between the two, and it began to feel a bit draining.

The romance itself also suffered a bit from this as well. Both Preston and Effy spend much of the book hiding things from one another, both preoccupied with not wanting to place a burden on the other. And, again, the fact that both characters had such similar experiences with in the romantic plotline, it began to feels as if their relationship was spinning its wheels, with a lot of words spent saying the same or similar things over and over again.

I did enjoy some of the deeper looks into the magic of this world. Most of this came through Preston’s side of the story, and I would argue that this is largely his story. But even here, while I enjoyed getting a better understanding of this history and magic, there didn’t feel as if there was enough of a plot to serve as a structure upon which to hang these descriptive elements.

Overall, this book felt like what it was: an unplanned sequel to a stand-alone fantasy story that had been complete on its own. The writing was luscious, as always, and I did enjoy elements of the love story. But ultimately, I came away from this one feeling as if it didn’t really add anything. I felt like Preston and Effy had ended the previous book with challenges ahead but with a new will to overcome, comfortable in themselves and their new relationship. And perhaps this book was honest about the reality of the hardships they would face and that that same will to move forward could begin to crumble in the face of these struggles. I just…am not sure those realities really make up a story, all on their own?

Fans of Reid’s will likely still want to check this one out. Quality wise, it’s still a well-written book with an interesting world. Effy and Preston also remained characters whom I loved and rooted for. I simply couldn’t get into the limited amount of actual “story” to be found here.

Rating 7: I still enjoyed the world, the characters, and the love story. But it felt clear that with the first book being planned as a stand-alone, this one didn’t really have anywhere to take the story.

Reader’s Advisory:

“A Theory in Dreaming” can be found on this Goodreads list: omg i love this cover.