CORE Shadow Trilogy Books in Order

The CORE world starts here. Shadow of Danger opens in a small Wisconsin town where clairvoyant Celeste Risinski becomes the only witness to a string of murders, not because she saw them in person, but because she sees them in brutal visions. That brings in CORE, a private criminal investigation agency run by Ian Scott, and it throws skeptical former FBI agent John Kain into Celeste's orbit.

From there, the trilogy expands instead of simply repeating the same setup. Shadow of Perception shifts to Chicago, where investigative reporter Eden Risk receives grotesque DVDs and has to work with her former lover, Hudson Patterson. Shadow of Vengeance moves the action to a Michigan university during Hell Week, with Rachel Davis and Owen Malcolm racing to stop a killer before more students disappear. Each book follows a different couple, but the shared world and recurring cast give the trilogy a strong connected feel.

That connection is part of the fun. CORE is not just a convenient employer that hands out cases. It feels like the center of a messy, overlapping network of agents, family members, old loyalties, and buried history. Ian Scott's past with Celeste's family casts a shadow over the first book, and the trust issues, old feelings, and unfinished business in the later novels keep the emotional stakes high even when the case itself is center stage.

The crimes are ugly.

These are dark romantic suspense novels with real bite. Mason likes serial killers, disturbing clues, and villains who leave damage behind, but she also likes pairing hard cases with strong chemistry and second chances. The settings matter too. Small town Wisconsin gives the opener a chilly, isolated feel, Chicago adds pressure and speed, and the Michigan campus in the third book turns rumor and ritual into something dangerous.

If you want a series that mixes police work, private investigators, lingering family secrets, and romance that has to survive a terrible week, this is the place to start with Mason's CORE books. The trilogy builds the world, introduces key players, and shows exactly what kind of stories she likes to tell, fast, tense, and just a little haunted.