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Sinclair Brothers (Shirlee McCoy) Books in Order

Part ofShirlee McCoy Books in Order

Browse the Sinclair Brothers books by Shirlee McCoy in order, with short summaries, series background, and guidance on where to begin.

Last updated: July 4, 2026

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Sinclair Brothers (Shirlee McCoy) books in publication order

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3 books

1

The Guardian's Mission

by Shirlee McCoy

2007

When Martha Gabler meets Tristan Sinclair near her mountain cabin, he claims to be an undercover ATF agent who needs her help. Pretending to be his girlfriend may be the only way they both get out alive.

2

The Protector's Promise

by Shirlee McCoy

2008

A woman in trouble has to rely on a determined protector who refuses to walk away from the case. As danger closes in, a promise of safety becomes something much more personal.

3

The Defender's Duty

by Shirlee McCoy

2009

Duty pulls a wary lawman into a dangerous case where protecting one woman could cost him everything. To finish the job, both of them will have to trust past fear less than the truth.

Sinclair Brothers (Shirlee McCoy) books in chronological order

  1. Book cover for "The Guardian's Mission"

    The Guardian's Mission

    by Shirlee McCoy

    2007Sinclair Brothers, Book 1
  2. Book cover for "The Protector's Promise"

    The Protector's Promise

    by Shirlee McCoy

    2008Sinclair Brothers, Book 2
  3. Book cover for "The Defender's Duty"

    The Defender's Duty

    by Shirlee McCoy

    2009Sinclair Brothers, Book 3

Series background & context

Sinclair Brothers is a compact romantic suspense trilogy built around three brothers and the dangerous work that keeps landing them in other people's crises. The books have the feel of McCoy's earlier suspense line, isolated settings, undercover work, fake relationships, and women who are pulled into danger before they have time to decide whom to trust.

The brothers are linked by family, but each story stands on its own. One book might open at a mountain cabin, another with a promise to protect, another with duty pulling a character into a situation he never wanted. The connective tissue is the same blend of action and emotional reserve.

These are short, direct, high-stakes reads.

McCoy uses the brothers well because they give the series continuity without overcrowding it. You get a sense of shared values and old history, but the spotlight stays on the central couple and the immediate threat.

If you want connected suspense that feels brisk and classic in structure, Sinclair Brothers is a good pick. It has wilderness tension, law-and-order energy, and romances built on trust that has to be earned very quickly.

Edited by

Richard Reis

Software engineer whose passion for tracking book recommendations from podcasts inspired the creation of MRB.

Anurag Ramdasan

Lead investor at 3one4 Capital whose startup expertise and love for books helped shaped MRB and its growth.

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