Dive deeper into the hidden worlds of the AIR Series. Cassie and her partners struggle with new enemies, but find help in unlikely places along the way.

A vacation isn't the same thing as running away. At least that's what I told myself.

Fenrisúlfr
Rider is distant, Vincent is uneasy, and Ethan is way too excited about meeting a bigfoot. When we find traces of the stalker, the scent Rider is tracking and what I see in the Path don't line up. Something strange is happening in the mountains.
Are we tracking a hunter, or something else altogether different?

Fractured Worlds

No phone, no gun, not even a hint of a coffee shop. What's a girl to do?
Discovering the body of a colleague before I'm cleared for active duty isn't a great start back to work, but being thrown into another dimension with a near stranger is a whole new level of grim.
We're trapped, hungry, and facing an unknown foe. Can we find a way home before we kill each other?

Reliquary

Vincent slipped between worlds once again, saving us all in the process. He's a Walker, it's what he does. Sure, he tried to kill me once, but that was in the past. The last thing I wanted was for him to go away, especially since our rocky past has authorities questioning his disappearance.

If Vincent doesn't surface soon, I don't need Gran to predict that my future contains bars.

Never-Ending Nightmare

It's one thing to have bad dreams, it's another to hunt them.

Boone needed backup, so the team is going into a steaming rain forest. Searching out the Lost in remote places was par for the course, but the lurking monster and forbidding terrain were not the only complications we faced.

We would need to pull together to face the nightmare before it kills again.