Knight Vigo's Log is a tome in Diablo IV. Written by Vigo, it is located in the Knights' Garrison in Yelesna in the Fractured Peaks.
It reads as follows:
7th. Lost a month's wages tonight. Unbelievable.
10th. A woman came to the mines. Gave me a wealth charm. Crazy, but it worked.
11th. Daughter showed up. Relentless. Something about a demon. Already reported it, but she won't give it up. Going to keep watch at the mine. Light knows she'll break in if I don't.