Order of Cryptid Hunters Books

American author Roland Smith crafted this captivating young adult adventure series that blends science fiction and fantasy elements. The story centers on twin siblings Grace and Marty O'Hara, both 13 years old, whose lives take an extraordinary turn when they go to live with their Uncle Wolfe on his isolated island home. There, the twins embark on thrilling quests to track down mysterious, undiscovered creatures.

Sometimes referred to as the Grace and Marty series, this four-book saga launched in 2005 with the inaugural novel "Cryptid Hunters." Smith continued the twins' adventures over nearly a decade, bringing their story to a close in 2014 with "Mutation." The books follow both their original publication sequence and the chronological order of events in the story.