410 Avenger by Jerry McGinley is a taut, fast-paced mystery that delivers the Pat Donegal/Shea Sommers series a riveting reunion of these well-loved detectives. Set against the backdrop of Wisconsin's contrasting landscapes-from the bustling streets of Madison to the quiet, rural corners of Kickapoo County-the novel follows Detective Shea Sommers as she returns from a vacation in France only to be thrust into two high-stakes investigations. In Madison, a series of murders has shaken the city, each victim linked by a disturbing and secretive common thread. Meanwhile, in Kickapoo County, a sheriff's department employee and a quirky newspaper editor have vanished under mysterious circumstances. With both cases unfolding nearly simultaneously, Sommers must rely on her longtime mentor, Pat Donegal, to help navigate the chaos and uncover the truth. McGinley masterfully weaves these dual narratives into a suspenseful and emotionally resonant story. The partnership between Sommers and Donegal-marked by mutual respect, sharp wit, and deep trust-adds a compelling layer to the plot. Their final collaboration spans several intense days and hundreds of high-speed miles, as they chase leads, confront danger, and piece together a puzzle that stretches across the state. Rich in regional detail and psychological nuance, 410 Avenger is more than a mystery-it's a story of loyalty, legacy, and the relentless pursuit of justice. Fans of the series will find this installment both satisfying and bittersweet, as it closes the chapter on one of McGinley's most enduring investigative duos.