David A. Dummer’s The Coded Crucifix opens with a killer slipping into the crowds at Pamplona’s San Fermín festival, then rewinds a week to show how he got there. FBI psychologist Aaron Thornton has been summoned to England by MI5 because a former patient will speak only to him. The man warns of an IRA operation in Spain involving a mercenary known as El Gocho. Thornton and MI5 analyst Sarah Maylor head to Pamplona with little more than a date and a name, and their search leads them from a struggling bull ranch to a crucifix marked with coded directions. Dummer gives the investigation a firm deadline: each day brings the festival, and whatever the plotters have planned, closer.

The novel gets much of its energy from watching people with different pieces of the story act on what they know. Thornton and Maylor chase records and interview witnesses; El Gocho studies their movements and changes his appearance; a rancher fights to protect a family legacy whose history is surfacing in nearby fields. Dummer makes Pamplona feel busy and physical, with packed streets, church interiors, bull pens, and mountain paths all shaping what the characters can do. The details of bull breeding and the running of the bulls give the chase its distinctive setting. At times, the briefings and explanations slow the momentum, especially when several institutions must be introduced in quick succession. Even so, those details make the search feel like work carried out by people who have to earn each useful clue.

Readers of Dan Brown’s The Da Vinci Code will recognize the pleasure of following an old religious object toward a hidden location. Dummer pairs that puzzle with a modern intelligence operation, and the crucifix matters because different people read its marks, history, and whereabouts in different ways. The Spanish Civil War and its aftermath run through the mystery as living concerns for families in the present. A recovered object can offer a lead to investigators and news about a missing brother to someone who has waited decades. That human connection gives the historical material weight. It also makes the novel’s wide cast easier to follow: beneath the changing leads and loyalties, many characters are trying to decide what they owe the people who came before them.

Thornton’s own history gives the thriller another source of tension. His earlier ordeal in Belfast still affects his sleep, his judgment of danger, and his need to keep control when the case grows personal. His partnership with Maylor develops through shared legwork and growing trust, which helps ground the larger conspiracy. The Coded Crucifix builds toward a vivid pursuit through the bull run, where the geography and customs Dummer has spent time establishing become part of the action. The closing chapters leave consequences for several characters still unfolding, in keeping with a series built around Thornton. It’s an involving, research-rich thriller for readers who enjoy a clue trail with a strong sense of place and investigators who have personal stakes in where it leads.

Pages: 402 | ASIN: B0GX2ZZG39