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Secret Lives Mysteries Books in Order

Part ofMark de Castrique Books in Order

Explore the Secret Lives Mysteries by Mark de Castrique in order, with summaries, series background, and an easy place to begin with Ethel Fiona Crestwater.

Last updated: July 14, 2026

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Secret Lives Mysteries books in publication order

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3 books

1

Secret Lives

by Mark de Castrique

2022

When a Secret Service agent is murdered outside her Arlington home, retired FBI agent Ethel Fiona Crestwater starts asking questions. With her college-age cousin Jesse, she follows stolen cash and corruption toward people willing to silence them.

2

Dangerous Women

by Mark de Castrique

2023

A violent attack leaves one victim dead and another comatose, drawing retired FBI agent Ethel Fiona Crestwater into political danger. With Jesse beside her, Ethel faces lobbyists, operatives, and a killer tied to a consequential Supreme Court case.

3

Desperate Spies

by Mark de Castrique

2025

A former colleague draws retired FBI agent Ethel Fiona Crestwater back into an operation that went wrong eighteen years earlier. With classified information at stake, Ethel and her cousin Jesse face adversaries prepared to kill for the truth.

Secret Lives Mysteries books in chronological order

  1. Book cover for "Secret Lives"

    Secret Lives

    by Mark de Castrique

    2022Secret Lives Mysteries, Book 1
  2. Book cover for "Dangerous Women"

    Dangerous Women

    by Mark de Castrique

    2023Secret Lives Mysteries, Book 2
  3. Book cover for "Desperate Spies"

    Desperate Spies

    by Mark de Castrique

    2025Secret Lives Mysteries, Book 3

Series background & context

The Secret Lives Mysteries center on Ethel Fiona Crestwater, a retired FBI agent in her seventies who has no interest in being treated as harmless. She runs a house in the Washington area where government workers have rented rooms over the years, and she has a deep store of professional contacts, practical skills, and sharp instincts. People tend to underestimate her. That is usually their mistake.

Ethel knows how Washington works.

The series begins with Secret Lives, when a Secret Service agent who boards at Ethel's house is murdered nearby. His final message points toward a secret, stolen money, and a trail of people who have reasons to hide what they know. Ethel takes up the investigation with Jesse Cooper, her younger cousin and a college student. Jesse is capable, but he is also learning that Ethel's quiet home life has concealed a much more complicated past.

Their partnership gives the books a lively rhythm. Ethel brings decades of investigative experience and a willingness to bend the rules when she thinks justice demands it. Jesse brings energy, loyalty, and a useful outsider's view of the strange situations surrounding them. Family is central here, not as a soft backdrop, but as the relationship that holds when official agencies, politicians, and old colleagues cannot be fully trusted.

The setting moves through Washington, D.C., Arlington, and the nearby corridors of federal power. These are not tour-guide mysteries. The city is a place of security agencies, private agendas, political pressure, and people who understand how information can become a weapon. Cases often start with one violent incident, then widen into threats involving corruption, espionage, or powerful figures with something to lose.

Ethel is the series' engine.

In Dangerous Women, a lethal attack and a Supreme Court case pull Ethel and Jesse into a fight involving operatives, lobbyists, and a killer. Desperate Spies looks back to an unfinished operation from years earlier, when an old colleague asks Ethel for help and classified information puts lives at risk. Each novel has its own central mystery, while Ethel and Jesse's trust in one another carries across the series.

Expect fast, plot-driven mysteries with a lead who has seen plenty and still refuses to sit on the sidelines. The tone has room for humor and family banter, but the danger is real. Begin with Secret Lives to meet Ethel, Jesse, and the network of relationships that makes the later books land best.

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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