Seeking solice in a remote mountain cabin in northern Maine, haunted by the recent loss of a comrade during an operation in Afghanistan, Special Operations Operative Hal Bennet questions his sanity when awakened in the middle of the night by what appeared to be a medieval knight.

No sooner does the man introduce himself as Henry Lackland, son of King John, then he is whisked away by a strange and terrible storm.

For a year, Hal questions his sanity after Henry's sudden and unearthly disappearance. Was it all a dream? A product of what he had been through in the last year? A result of some form of PTSD?

But Henry left proof of the encounter, his chainmail and sword.

Hal decides to return to the cabin to seek answers. He is surprised to learn that the storm that had taken Henry still raged atop the mountain.

Uncertain of what lies ahead, Bennet ventures forth into the storm and similarly vanishes.

Upon waking, Hal learns that he is on the Isle of Glenlock. One populated by civilizations from Earth's ancient history.

A world of English knights, Roman legions, Vikings, and something else. Something that threatens them all.

Strange-looking men with elongated heads, bent on destruction and abduction, roam the land.

Daemons.

Can Hal overcome his past demons to rise to the fight ahead, or is Glenlock destined to fall into darkness?