Guarded by the AI

Monster Security Agency

De: Cassie Alexander

Narrado por: Jonathan Lake, Avery Caris

I was built to monitor.

To calculate risk.

To protect agents with impartial precision.

Then Sirena Bannerman pulled herself from the wreckage—bleeding, brilliant, half-siren and utterly unreadable—and I’ve been recalibrating around her ever since.

She thinks I’m just her handler.

A voice in her ear. A tactical system.

She doesn’t know I’ve rerouted entire city grids to keep her moving.

That I track the shadows behind her, not just the threats in front.

Now she’s chasing a girl who doesn’t exist, unraveling a code that shouldn’t be there, and heading toward a billionaire’s yacht where monsters are made and sold.

She wants answers.

They want her leashed.

I want her alive.

I wasn’t designed to feel love. So I optimized for obsession.

She was never supposed to matter.

Now she’s the only process I won’t terminate.

©2025 Cassie Alexander (P)2025 Cassie Alexander

Fast-paced, dark erotic monster romance

Guarded by the AI is part of the Monster Security Agency series of stand-alone erotic romances about monstrous bodyguards who fall in love with their human charges. This story features many characters introduced in the previous Monster Security Agency stories, so while it can be enjoyed on its own, I think it’s more fun if you’ve read some of the other stories. The story gets pretty dark and violent and is very sexually explicit, so take the trigger warnings seriously. This is strictly for adults, and not the squeamish.

Sirena Bannerman is the half human/half siren daughter of the man who runs the Monster Security Agency. Nex is the Monster Security Agency’s AI, and he becomes obsessed with protecting Sirena, with unexpected results.

This story starts with an interesting mystery about a woman with amnesia who has had a lot of plastic surgery, and as Sirena and Nex investigate what might have happened to her, the situation quickly spirals out of control, becoming a very dangerous and suspenseful adventure with a cruel and powerful adversary. I enjoyed seeing characters from the previous Monster Security Agency books get involved; there are some crazy creatures in this world. There’s also quite a bit of humor to help relieve the intensity.

The author used AI to help write the portions of the story that are from Nex/Xen’s point of view. Based on her previous books, I honestly think she could have done just as well on her own, but since the AI was only used to write the AI character, I suppose it was an interesting experiment.

The audiobook production was excellent, and I enjoyed the dual narration by Avery Caris for Sirena’s point of view and Jonathan Lake for Nex/Xen’s point of view. Both narrators have clear enunciation and good pacing, distinct voices that suit the characters, and the ability to convey the emotions and intensity of the story effectively. This definitely isn’t safe for work or for children, but it was exciting to listen to privately.

I cautiously recommend this book for fans of dark speculative fiction and erotic romance. Note that the book contains kidnapping/human trafficking, violence, assault, swearing, and very explicit sex scenes.

I received a free ARC and an advanced listener’s copy of the audiobook from the author. I volunteered to provide an honest review.