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2 Sisters Detective Agency

by James Patterson

The 2 Sisters Detective Agency series by James Patterson has 2 known books (2 published) and is best read in publication order, starting with 2 Sisters Detective Agency (2021). The latest book with a fully recorded publication date is 2 Sisters Murder Investigations.

Books
2 known books (2 novels)
Published
2
First published
2021
Status
ongoing
Shelved under
Thriller
Last checked

Start here: 2 Sisters Detective Agency (2021) — then read straight through in publication order.

Book one

Cover of 2 Sisters Detective Agency

2 Sisters Detective Agency (2021)

Reading order

The date order of published books and any announced future entries — the default way to read the series.

  1. 2 Sisters Detective Agency

    Novel

    2 Sisters Detective Agency, published in October 2021 by James Patterson and Candice Fox, opens the series at 416 pages, introducing former attorney Rhonda Bird and her street-smart half-sister Baby as they unexpectedly inherit a struggling Los Angeles detective agency.

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  2. 2 Sisters Murder Investigations

    Novel

    2 Sisters Murder Investigations followed in April 2025 at a shorter 368 pages, continuing Rhonda and Baby's partnership with a self-contained case that builds on the agency established in the first book.

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About the 2 Sisters Detective Agency series

Rhonda Bird is a buttoned-up former attorney; her teenage half-sister Baby is a street-smart survivor with none of Rhonda's polish. When they unexpectedly inherit a struggling Los Angeles detective agency, the mismatched pair have to learn to work together while untangling cases that reach into the city's darker corners. James Patterson and Candice Fox -- also his collaborators on Detective Harriet Blue and the Bill Robinson/Inn series -- use the sisters' contrasting styles and generational gap for both the series' investigative dynamic and its comic friction.

2 Sisters Detective Agency (2021) sets up the inheritance and the sisters' uneasy partnership; 2 Sisters Murder Investigations (2025) continues their casework as the agency (and their relationship) develops.

Frequently asked questions

How many 2 Sisters Detective Agency books are there?

Two: 2 Sisters Detective Agency (2021) and 2 Sisters Murder Investigations (2025).

What order should I read the 2 Sisters Detective Agency books in?

Publication order -- 2 Sisters Detective Agency, then 2 Sisters Murder Investigations.

Who are the two sisters?

Rhonda Bird, a former attorney, and her teenage half-sister Barbara 'Baby' Bird, who inherit and run a Los Angeles detective agency together.

Who writes the series?

James Patterson co-writes with Australian crime novelist Candice Fox, his collaborator on Detective Harriet Blue and the Bill Robinson series.

Is there a third book coming?

No further title had been announced as of this writing.

Reading order last verified .