Guarded by the Nightmare

Monster Security Agency

By: Cassie Alexander

Narrated by: Jonathan Lake, Avery Caris

No one survives hiring me. Not even her.

I’m a Nightmare, a creature that feeds on fear, and I’m capable of boundless cruelty—which is why my services come at a steep price: the life of the person who hired me. As such, the only people who hire me on are those brought to me by fate, like Mina, a woman so desperate for revenge that she’s willing to spend her own life to get it.

I don’t usually care why I’m hired. Human affairs don’t matter to me. Food is food, and a job is a job.

Mina’s enemies will get what they deserve—and I’ll get what’s mine.

Her beating heart.

Monster Security Agency is the most elite bodyguard service in the world. These monster bodyguards are lethal, powerful, and determined to protect their clients at all costs. They shouldn't fall in love with their principals, but if they do? Things are bound to explode.

Here come spicy, romantic, and action-packed tales by your favorite paranormal and sci-fi romance authors: Cassie Alexander, Layla Fae, and Cara Wylde. Dive into the world of the Monster Security Agency.

©2024 Cassie Alexander (P)2024 Cassie Alexander

A delightfully sweet story for a dark romance.

I really enjoyed this book. It was original, well written, had characters I actually cared about that showed growth, no boring spots , decent steam, and a heartwarming sweet HEA ending. Besides all that, the narration was well done and from dual perspectives. Very entertaining and enjoyable. Absolutely worth a credit.

Starter dark romance with happy endings

Starter dark romance. If you’re not sure if u like or don’t know where to start this would be a good book to start with. HEA. The male voice actor needs to do more…❤️❤️❤️🌶️🌶️

The narrators.

You want an unusual story, a deep velvety voiced Nightmare with a tortured soul heroine too? This is a HEA story for you. Absolutely brilliant!

Shadows have never been so sexy

Narrated by Avery Caris and Jonathan Lake


📚⭐️⭐️⭐️⭐️ 4.5 rounded to 5
🌶 🌶 🌶
🎧⭐️⭐️⭐️⭐️⭐️

Mina and The Nightmare aka Sylas

• Trauma • Paranormal • Magic • Revenge • Monster Romance • Dual POV • Timeline jumps Touch her and Die

This is my first Cassie Alexander book - and I'm excited to read the others in the Monster Security Agency world. The entire premise of this book is unique - People can hire Sylas to kill others for them, however it comes at a steep price. Sylas is a shadow/smoke/nightmare that can wisp himself away, through walls, and change his body (including can summon multiple of any body part...).

As Mina is looking to find her revenge, she stumbles across details that lead her to the Monster Security Agency. Feeling hopeless, she figures there is nothing more to lose. As Sylas and Mina spend more and more time together, they find each other... more than tolerable. Sylas becomes a space of comfort and safety Mina was missing.


The narrators... OOOF. So. Good. They both embodied the part so very well.
Avery Caris was feminine and was able to showcase the underlying tone of anger, fear, and trauma from our MFC.
Jonathan Lake - gosh. Just perfection with the voice of the Nightmare. The intonation and pace was perfection.

This book was well written as a standalone. There was likely a couple spots that would have had more context had I read the previous books, however that didn't take away from the storyline.

NOTE: As always, read trigger warnings. This book is well written, however does talk about assault and trauma.


I received a copy of the audio from Home Cooked Books and listened to it through BookFunnel. I am voluntarily leaving this honest review.


Best of the series

Loved the Kraken, but Nightmare was the best so far in my view. It intrigued me how a shadow of Nightmare can ever be with a human. But the story of Silas and Mina had proved to be the most fantastic one and simultaneously emotional, considering what the FMC went through. And Silas morphing from evil to kind but still with the hint of sinister was well written. The screaming during 🌶🌶🌶 was more than I bargained for but expected it, I guess LOL. Enjoyed the read!

the dynamics of the main characters relationship was interesting and morbidly beautiful.

I liked the story for the most part. not exactly the most original but it was interesting enough to keep me listening. overall it was a good story. the sex was hot to!

love monster security

all of the monster security agency novels are my favorite honestly haven't bought one i didn't like.

We need more books like this!

We need more decent stand alone novels like this, in this genre. Audible needs to wake up and smell the coffee on the need for good stand alones like this.
LOVED IT!

Hell yeah!!!

I was so skeptical about this book and it was mind blowing. It was the best most sexy book I ever read 10 out of 10 recommended

This story is amazing!

Guarded by the Nightmare is book #8 in the Monster Security Agency series. I'm a fan of this author and her romantacy stories, but this one was so different (in a fantastic way) that I binged it from start to finish. **Check the trigger warnings as some issues are referenced** Silas/Nightmare and Mina team up for one week to bring justice to those that have wronged her and her best friend at a frat party. The character building, the descriptive writing, the extremely innovative smexy scenes...just a big WOW factor. It's not often that you are rooting for the "nightmare", but here you go. You can't help but hope there's a way these two can find an HEA. This is a standalone, but characters from previous books are referenced and included.

The narration was incredible! Jonathan Lake (who sounds remarkably like a narrator I love??) and Avery Caris really brought this story to life. This is definitely a "the audiobook was better" stories for me. I loved it. 5/5 stars!!