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Mastermind Murderers: The Complete Series: A Four-Book Psychological Thriller Collection
The complete Mastermind Murderers psychological thriller series—four full-length novels in one chilling box set.
Step inside the mind of Dr. Raine Walsh, a psychologist who discovers that the darkest experiments aren’t confined to the lab. Across four pulse-pounding books, every case pushes her closer to killers, conspiracies, and truths that should never be uncovered. Perfect for fans of twist-ending crime thrillers and binge-worthy suspense.
Included in this
The Altruism Effect
A kidnapped psychologist. A murderous warden. There’s more to this prison than meets the eye…
The Bystander Effect
A psychologist looking for closure. An untested detective desperate to prove himself. And a killer who could be anyone…
The Carbon Effect
One person’s delusion is another’s reality—and reality may be the most dangerous weapon of all.
The Domino Effect
How can a psychologist and a PI know what’s in another’s mind, when they are trapped inside their own?
Step inside the mind of Dr. Raine Walsh, a psychologist who discovers that the darkest experiments aren’t confined to the lab. Across four pulse-pounding books, every case pushes her closer to killers, conspiracies, and truths that should never be uncovered. Perfect for fans of twist-ending crime thrillers and binge-worthy suspense.
Included in this
The Altruism Effect
A kidnapped psychologist. A murderous warden. There’s more to this prison than meets the eye…
The Bystander Effect
A psychologist looking for closure. An untested detective desperate to prove himself. And a killer who could be anyone…
The Carbon Effect
One person’s delusion is another’s reality—and reality may be the most dangerous weapon of all.
The Domino Effect
How can a psychologist and a PI know what’s in another’s mind, when they are trapped inside their own?
747 pages, Kindle Edition
Published August 26, 2025
About the author
Kristin Helling
22 books43 followersKristin Helling writes stories that invite readers into small-town secrets and edge-of-your-seat suspense. She is the author of the Roastwood Hollow Cozy Mystery series, where charming coffee shops, quirky neighbors, and autumn festivals are never too far from a chilling murder. Kristin also writes thrillers and suspense novels, blending heart-pounding twists with deeply human characters who face danger, deception, and dark truths.
A lifelong booklover, Kristin grew up with a passion for storytelling and the idea that even the coziest places can hold the deepest mysteries. When she’s not writing, she owns a coffeehouse/roastery/bakery, co-owns her publishing company Wordwraith Books, is married to a photographer, and is Mama of two.
Her writing reflects her love of community, mystery, and the delicate balance of warmth and danger. Whether you prefer a comforting whodunit by the fire or a thriller that keeps you up all night, Kristin has a story to share.
📚 Series: Roastwood Hollow Cozy Mystery (In Roast Mortem, In Cold Brewed, Roastly Apparitions, with more to come!)
🔎 Genres: Cozy mystery, thrillers, suspense
☕ For fans of: Gilmore Girls, Agatha Christie, and stories that blend charm with chills
A lifelong booklover, Kristin grew up with a passion for storytelling and the idea that even the coziest places can hold the deepest mysteries. When she’s not writing, she owns a coffeehouse/roastery/bakery, co-owns her publishing company Wordwraith Books, is married to a photographer, and is Mama of two.
Her writing reflects her love of community, mystery, and the delicate balance of warmth and danger. Whether you prefer a comforting whodunit by the fire or a thriller that keeps you up all night, Kristin has a story to share.
📚 Series: Roastwood Hollow Cozy Mystery (In Roast Mortem, In Cold Brewed, Roastly Apparitions, with more to come!)
🔎 Genres: Cozy mystery, thrillers, suspense
☕ For fans of: Gilmore Girls, Agatha Christie, and stories that blend charm with chills
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