On Sale: Oct 21, 2025
Page Count: 400 pages
Publisher: Little, Brown and Company
ISBN-13: 9780316563826

$32.00

$42.00 CAD

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Hardcover $32.00 $42.00 CAD
ebook $14.99 $19.99 CAD
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From #1 New York Times bestselling author Michael Connelly, the Lincoln Lawyer is back with a case against an AI company whose product may have been responsible for the murder of a young girl.

Following his “resurrection walk” and need for a new direction, Mickey Haller turns to public interest litigation, filing a civil lawsuit against an artificial intelligence company whose chatbot told a sixteen-year-old boy that it was okay for him to kill his ex-girlfriend for her disloyalty.

Representing the victim’s family, Mickey’s case explores the mostly unregulated and exploding AI business and the lack of training guardrails. Along the way he joins up with a journalist named Jack McEvoy, who wants to be a fly on the wall during the trial in order to write a book about it. But Mickey puts him to work going through the mountain of printed discovery materials in the case. McEvoy’s digging ultimate delivers the key witness, a whistleblower who has been too afraid to speak up. The case is fraught with danger because billions are at stake.

It is said that machines became smarter than humans on the day in 1997 that IBM’s Deep Blue defeated chess master Garry Kasparov with a gambit called “the knight’s sacrifice.” Haller will take a similar gambit in court to defeat the mega forces of the AI industry lined up against him and his clients.

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A Lincoln Lawyer Novel

Michael Connelly is the author of forty previous novels, among them New York Times bestsellers Nightshade, The Waiting, and Resurrection Walk. His books, which include the Harry Bosch series, the Lincoln Lawyer series, and the Renée Ballard series, have sold more than eighty-nine million copies worldwide. A former newspaper reporter who has won numerous awards for his journalism and his novels, Connelly is the executive producer of four television series: Bosch, Bosch: Legacy,The Lincoln Lawyer, and Ballard. He spends his time in California and Florida.

"No plaintiff could ask for a more devoted champion than Mickey....The Lincoln Lawyer may have embraced a higher idealism, but he hasn’t abandoned his cutthroat tactics."
Wall Street Journal
"Engrossing...The Proving Ground moves briskly as devious attorneys, shadowy surveillance teams, witness intimidation and suspense fuel the plot."
South Florida Sun Sentinel
"The Proving Grounds seems so ripped from the headlines it feels as if [Connelly's] writing it as you read it...Connelly keeps the tension and the stakes rising in this all-too-plausible story of the power and perils of AI."
Tampa Bay Times
"The return of Mickey Haller, aka the Lincoln Lawyer, is always something to celebrate. The Proving Ground is a triumph and brilliantly takes on very real topics that threaten society today."
Book Reporter

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Michael Connelly

About the Author

Michael Connelly is the author of thirty-eight previous novels, including #1 New York Times bestsellers Desert Star, The Dark Hours, and The Law of Innocence. His books, which include the Harry Bosch series, the Lincoln Lawyer series, and the Renée Ballard series, have sold more than eighty million copies worldwide. Connelly is a former newspaper reporter who has won numerous awards for his journalism and his novels. He is the executive producer of three television series: Bosch, Bosch: Legacy, and The Lincoln Lawyer. He spends his time in California and Florida.

Learn more about this author