Fearless introduces us to Gaia Moore, a girl born without the gene for fear. Gaia's mother was murdered, and her father, Tom Moore, a famous covert antiterrorist mastermind, is in hiding. Now 17 years old, Gaia is living in New York City with Tom's CIA friend, George, and his wife, Ella. Gaia is a prime target for terrorists and is in constant danger, but she is trained in all forms of combat so she can defend herself. Like Buffy and Xena, Gaia Moore is a force.

But she is also a high school student, trying to be like everyone else. As her friendships develop, we see that Gaia is in many ways a typical teen -- when she's not busy getting herself into and out of dangerous situations, righting wrongs, avenging hurts, and solving mysteries.