In the attic of the Watchers' large Edwardian house in San Francisco, a box is discovered.

Within the box are 100-year-old stories of ghost killers of the old. And among them, a diary, dated in 1915 and written by a young man named George Sinclair.

Strange drawings and writings in the diary tell of something sinister, and the final entry is loud and clear: George is a ghost killer, and he is being hunted. Modern-day George Sinclair knows that this discovery could be the key to his unknown heritage.

George and his friend travel to Pennsylvania to investigate. The more they learn, the clearer it becomes that something terrible happened in 1915, and it directly involved George's great-grandfather.

And now, it is happening again. As powerful supernatural forces come into play, the ghost killers are dragged into a fight for their lives.