Ryland & St. Clair Books in Order

The Ryland & St. Clair series follows two former FBI behavioral analysts who swap federal badges for private investigator licenses but never quite escape the shadow of their last case. River Ryland and Tony St. Clair survived a brutal encounter with a serial killer that left them both scarred, physically and emotionally. Now they run a small investigative agency in St. Louis, hoping to choose safer work while still using their skills.

In Cold Pursuit, their first client is a grieving mother whose teenage son vanished four years earlier. Law enforcement has moved on, but she needs closure. River knows the odds of finding him alive are slim, yet she agrees to take the case. The search leads them into a private school with secrets, a group of students hiding more than teenage mischief, and a killer determined to keep the past buried. At the same time, River is caring for a mother in the early stages of dementia and wrestling with the question of whether God can be trusted after everything she has seen.

Cold Threat brings an old nightmare back to life. Twenty years earlier, a string of murders in Des Moines ended with a suspect behind bars and a snowman ornament left at each scene. When new killings in a small Iowa town mirror those crimes, Tony’s detective father asks for help. River and Tony join him, trying to decide whether they are facing a copycat or proof that the original investigation was wrong. As temperatures drop and threats mount, past mistakes and unresolved family tensions push them to the edge.

In Cold Vengeance, the pair are hired to find a missing true crime podcaster who disappeared while researching a possible undetected serial killer. As they retrace her steps, they uncover a chilling pattern of deaths that no one has connected and realize the podcaster may have stumbled onto something far bigger than she imagined. The killer’s attention soon shifts to River and Tony themselves, turning investigators into targets.

The series is unified not just by its characters but by its atmosphere. Each book unfolds against a winter backdrop, using snow, ice, and early darkness to heighten the suspense. Nancy Mehl leans into the psychological cost of spending a career inside other people’s nightmares. River’s PTSD, Tony’s memory issues from past injuries, and their slow growing feelings for each other all play into how they approach each case.

Readers who enjoy private eye stories with FBI level profiling, strong relational threads, and a clear but gentle faith element will find Ryland & St. Clair a compelling trilogy. The books form one long arc as River and Tony work through their shared history, so starting with the first is recommended.