In Between

by Cassie Cooper

Annabelle Croft has spent years avoiding ghosts, secrets, and the kind of attention that ruins your life. Being the girl everyone calls Creepy Croft is bad enough without the dead following her home, whispering warnings, and asking for help.

Then Will Monroe—the school’s golden boy and her awkwardly cute lab partner—vanishes.
When he comes back as a ghost, he remembers only fragments: a notebook full of strange symbols, a hidden warning, and Annabelle at the center of something dangerous. Something tied to witches, blood moons, and a shadow so old it’s been waiting for centuries.

The deeper Annabelle digs, the clearer the truth becomes: Will isn’t just haunted. He’s the vessel. And if the ritual succeeds, the thing they’re calling back won’t just take his body—it will consume everything he is. To save him, Annabelle will have to face the powers she’s spent her whole life fearing…before the door opens for good.

362 pages, Kindle Edition

First published October 13, 2026

About the author

Cassie Cooper has been telling stories since childhood, when she bound together whatever scraps of paper she could find to create books about princesses and unicorns. She went on to study creative writing in college, determined to learn everything she could about storytelling.

Nowadays, she writes character-driven stories in whatever genre her characters tell her to—mostly young adult fiction and contemporary romance, sometimes with a touch of the supernatural.

Cassie lives in Florida with her husband, three kids, and dog. When she isn’t writing, she can usually be found outside examining cool bugs and plants.

Find her online at cassiecooper.com.

Reviews

[Kierra King · Rating 5 out of 5]

This book literally took over my life .Seriously. When i wasn’t reading it, I was constantly thinking about it and any spare time I got I would pick it up. This book was EVERYTHING and more. It had an overall spooky vibe (it had a similar vibe to early 2000s vampire diaries and charmed for me). The book constantly kept me engaged and wondering what’s gonna happen next, I fell in love with the characters (especially Ben) so I need a second book ASAP!

[Tracy · Rating 5 out of 5]

I give this book 5 stars! Cassie Cooper tells the story of Annabelle and her struggles with her gift in such a way that you can feel how Annabelle feels. The fear, frustration, confusion, and then the sadness of knowing her family does not believe her. I liked watching her relationships with a few people gradually grow into friendships.

I have always loved ghost stories and this one is one of my favorites. Cassie Cooper has brought to life what it might be like being a spirit and not knowing what to do with that knowledge.
I received an advance copy via Booksprout from the author and am voluntarily leaving a review.

[Kristi Miller · Rating 5 out of 5]

I am not usually a ghosty book girl because my imagination is too active, but this had me hooked! It was spooky, but not in a give you nightmares kind of way. The romance thread of the story was very well done, I found myself feeling butterflies for Annabelle.
I literally read the book in one day (stayed up till 2 am!) because I NEEDED to know how things ended! It was worth the sleep deprivation.
I loved watching Annabelle grow as a person throughout the book and I felt like I was really able to connect with her emotions. I enjoyed making guesses about where the storyline would go and then bring surprised by an angle I hadn't fully considered or even thought of. I laughed, I cried and felt that internal sigh of satisfaction when I finished the final page. I can't wait for future books in this series!

I received an arc copy via booksprout and am voluntarily leaving this review.

[Reader · Rating 5 out of 5]

I really enjoyed In-Between the Séance! I was hooked from the beginning because of the supernatural mystery, and I kept wanting to find out what was going to happen next. I especially liked Annabelle because she felt like a character I could actually connect with, and I enjoyed seeing her learn more about herself throughout the story.

One of my favorite things about the book was how it mixed ghosts, mystery, friendship, family secrets, and romance. There were quite a few moments where I was surprised by what happened, and I liked that I couldn’t always predict where the story was going.

Overall, I thought this was a really fun and interesting book. I got attached to the characters and found myself get lost in the book because of the suspense of the mysteries. I would definitely recommend it to someone who enjoys supernatural stories with suspense, mystery, and a little romance.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Quincey Guthrie · Rating 5 out of 5]

The book was so good, the plot was very enticing and entertaining.It was very original i have never read anything like it. The end definitely made me shed some unexpected tears.

[Marie · Rating 4 out of 5]

In Between by Cassie Cooper is an absolute delight. Reading it instantly triggered a wave of nostalgia for the R.L. Stine books I read, and loved, as a young adult. The story is grounded by a cast of incredibly endearing characters whose struggles and growth pulled me in from the very beginning. I thoroughly enjoyed this book; it strikes the perfect balance between suspense and heart. I highly recommend it for young adults and older readers alike who appreciate a well-crafted mystery. It is a fantastic, spooky read perfect for the fall season!

ARC book was provided by Booksprout.

[alicia · Rating 4 out of 5]

I enjoyed this book, it kept my attention and was hard to put down.

[Lina Abboud · Rating 5 out of 5]

This book reignited my love of reading! I’ve been busy with life and never had the time nor the motivation to read. But this novel made it so easy, because I was hooked from the beginning to the end! I found myself staying up way past my normal bedtime reading page after page! Even my husband noticed that it wasn’t my normal to be staying up late READING and said, “It must be a REALLY GOOD book!”….and YES it was!! This is the motivation that I needed to start my reading journey. Can’t wait for her next book!!❤️