In the ''Amulet,'' Hendrick Conscience has worked up an incident which occurred at Antwerp, in the 16th century, into a story of great power and deep interest. It was a dark and bloody deed committed, but swift and terrible was the retribution, strikingly illustrating how God laughs the sinner to scorn, and how the most cunningly devised schemes are frustrated, when He permits the light of His avenging justice to expose them in their enormity.