Crack detective, inventor, and woman of mystery Ace Carroway's next case turns personal when one of her associates goes missing. It's summer solstice at Stonehenge, 1922. Archaeologist Sam Biming keeps a midnight vigil to make sure none of the tourists trip into his dig site. A horrible scream rips through the air: the sound of sudden, excruciating death. The crimson splashes on the heel stone tell of grisly bloodletting. But no slashed body...