The Quotient Series
Join Jack and Sarah as they race to save humanity in this techno-thriller series by Gregory R. Simpson.
The Books
The Quantum Contingent
A fast-paced techno-thriller weaving together quantum computing, espionage, drone warfare, and global stakes. Follow Jack and Sarah as they uncover a conspiracy that could reshape the world.
Quantum Time
The gripping sequel deepens the world of the Quotient series. Available in ebook, paperback, and audiobook — narrated by the author himself.
Quantum Launch
The prequel to the Quotient Series. Before Jack and Sarah, there was the mission that started it all. Coming 2027.
Praise for the Series
"A riveting techno-thriller that blends cutting-edge science with pulse-pounding espionage. Simpson's vivid imagery and exciting dialogues make for a gripping read that keeps you on the edge of your seat from start to finish."— Rabia Tanveer, Readers' Favorite, on The Quantum Contingent
"A masterfully crafted sequel that will appeal to lovers of time travel, sci-fi, and espionage thrillers. Simpson delivers spell-binding plot twists and deeply human characters facing seemingly invincible villains. A must-read for fans of the genre."— Keith Mbuya, Readers' Favorite, on Quantum Time
Explore the World of the Books
Dive deeper into the technology, real-world locations, and interactive fiction behind the series.
Technology
Quantum computing, AI, drone swarms, and more — the real science behind the story.
Locations
From Oxford to Ngorongoro Crater — explore every real-world setting on a map.
The Game!
Play Quotient — an interactive text-adventure set in the world of the series.
Blog
Weekly posts on writing, technology, locations, and behind-the-scenes updates.