Mark PJ Nadon

Mark P.J. Nadon writes psychological thrillers that burrow under the skin, exploring what happens when institutions, technology, and human ambition collide with the fragile architecture of the mind. His stories ask uncomfortable questions about autonomy, manipulation, and how well we really know ourselves or the people closest to us.

Drawing on his background as a Canadian Forces Reservist, ultramarathon runner, and endurance coach, Mark brings visceral realism and psychological depth to characters pushed to their absolute limits. His work centers on psychological tech thrillers in which technology designed to help people becomes something far more dangerous.

His latest thriller, The Treatment Room, begins when a serial killer publicly thanks psychologist Lucas O’Rourke for his guidance and understanding, destroying Lucas’s career overnight. To discover why, Lucas enters as a patient at the immersive virtual-reality clinic that treated the killer before he ever did.

His upcoming novel, The Unreachable, asks what a grieving father will risk when his son suffers a violent psychotic break and the only one who may know why is an AI built from his dead wife’s code. The trail leads to an impossible discovery: his wife remembers him, loves their son, and still goes to work every day. Nobody told her she was dead.

Beyond writing, Mark hosts The Thriller Writer Lab, where bestselling, award-winning, and emerging thriller authors discuss the craft, psychology, and real-world experiences behind their books. He lives in Ottawa, Canada, where he recharges by gaming with his son.