The Probability of Time

The Arrowhead Killer is dead! After a decade of hunting the city of Grimwick’s most notorious serial killer, Detective Liam Smart finally feels the colossal weight of this case lift from his shoulders. Justice for the killer’s fifteen victims has been served—or so he thought.

When a new victim is discovered, Liam fears the killer may have had an apprentice — or worse, he arrested the wrong man. Determined to bring swift justice, he enlists the help of Loralei, a young, enthusiastic historian who may have knowledge vital to unlocking this new mystery.

But as the case’s evidence begins to build, Liam quickly discovers Loralei isn’t just beautiful and smart, she has a secret. And the longer he pursues the killer, the more he gets dragged into the middle of a secret war that’s responsible for reshaping the American political landscape until he has no choice but to join the fight.

Described as a unique blend of mystery, crime drama, and science fiction, Tim Koster’s debut novel is a well-paced time travel thriller full of unexpected twists and turns, a budding romance, and an ending that will leave you asking “what’s next?”