Book cover of Sigma by Tiya Rayne
My rating
5/5
·
LOVED IT!
Spice level
4/5
·
Explicit scenes
Price
Kindle Unlimited
$4.99 (Kindle, April 3, 2026)
Jump to

Book Review: Sigma

Alpha #2 · by Tiya Rayne
Underrated gem
Part of a series
Medium burn
Explicit scenes
MF romance
18+
Intended for mature audiences

Book details

Published
2022
Length
298 pages
Format
Kindle
Narration POV
1st-Person Multiple

About the story

MF paranormal military romance sequel: After escaping her ex, Shiloh enters a secret breeding program and finds Sigma—a super-soldier who reveals the truth behind everything that book 1 kept hidden.

About the series

Sigma is book #2 of the Alpha series

Reads as standalone?

Depends, in my opinion, this book spoils earlier books in the series, and that’s a deal breaker for me, but it might not be for you.

Books in series
2
Series status
Completed

Rating & review

Tags
Underrated gem
My rating
5/5
·
LOVED IT!
Read in
2025

Character & romance details

I finish ripping the rest of the clothing off her. Using my foot, I kick her legs further apart. Wrapping an arm around her waist, I lift her off the ground.
Tiya Rayne, Sigma

About the romance

Steam level

4

/5
Explicit scenes
Burn / Pacing

 Medium burn

Relationship type

 MF

About the female lead

About the love interest

Who will love this book

Sigma is perfect for readers who enjoy:

• Paranormal romance tied to military/super-soldier experiments
• Fated mates with high external stakes
• Strong, skeptical heroines who don’t fall easily
• Alpha heroes who are protective and lethal
• Companion novels that reveal the other side of the story

With his eyes on mine, he waits. It takes my sex-hazed brain a few minutes to realize what he’s waiting for. He wants my consent.
Tiya Rayne, Sigma

Books similar to Sigma

Icon guide:
Very popular
Popular
Favorite
Underrated gem
Rating
Spice level
HOT book

    If you want another super-soldier/human-experiment hero, but one who’s more animal than alien…

  • Book cover of Fury by Laurann Dohner

    5

    /5

    5

    /5
    HOT
    Erotic romance: Ellie discovers that her employer creates human–animal hybrids and becomes drawn to Fury, one of its captive subjects. After being freed, Fury battles his attraction to Ellie—but it’s a losing battle.
The author of the Romance Book Matchmaker blog hugging her books and kindle in black and white

Oh hey! I’m Becky, book hugger and the one-woman team behind RBM. I hope my reviews help you find a story you’ll love.

Why This Blog ExistsRBM Steam, Ratings & Tags Explained