Sins of the Sigma Series by Summer Robert

4.75 · 4 ratings
  • Caged (Sins of the Sigma #1)
    #1

    Caged (Sins of the Sigma #1)

    Summer Robert

    Rated: 4.67 of 5 stars
    · 3 ratings · published 2025

    A deadly secret society. A psychotic obsession. A caged heroine who fights back. A power-hungry, morally-black fraternity president makes a deal with Sigma’s secret society of alumni to save his high-society family from ruin. Their price? Blood. But Kieren Hunt was always meant to play God and with his obsession, Monroe Campbell, by his side, resurrecting Sigma’s deadly, hedonistic traditions to pay his debt will be like shooting fish in a barrel... more

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  • Collared (Sins of the Sigma #2)
    #2

    Collared (Sins of the Sigma #2)

    Summer Robert

    Rated: 5.00 of 5 stars
    · 1 ratings · published 2026

    Seven days to stop them. Seven days until she dies. Gabi knew getting involved with Monroe’s revenge plan against Sigma was a risk, but she never expected things to go this far. She didn’t know her best friend would sacrifice herself, and although she knew her ex-boyfriend, Jace, was her enemy, she never thought he would let her become Sigma’s prisoner with a collar around her neck and leave her for dead... more

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