: Written by a seasoned screenwriter, the chapters are short and fast-paced, making it a perfect candidate for its 2025 film adaptation starring Blanca Suárez and Daniel Grao .

This macabre scene is a near-identical copy of an unsolved murder from six years prior. To solve the case, two former partners with a complicated romantic history— and Daniel Velarde —must reunite to track down a killer who seems to be sending messages from the Paleolithic era. Why This Book Stands Out

: While the town of Niebla is fictional, the archaeological details are meticulously researched. The book features real locations like the Museum of Human Evolution and the Archaeology Experimental Center (CAREX) .

: Ríos San Martín explores whether "evil" is a modern invention or an evolutionary trait. The narrative dives into how we have evolved since our ancestors committed the "first murder" 400,000 years ago.

The story begins with a chilling discovery at the in Burgos. During a routine school visit, a group of teenagers finds a body in a Neanderthal burial reconstruction. The victim is Eva Santos, a local girl found in a specific fetal position that mirrors ancient ritualistic burials.