But sometimes that choice is made for us: a piece of the present simply falls away, and the past is exposed like old bone. Afterward, nothing can ever be the same again, and we are forced to reassess the form of what we believed to be true in the light of new revelations about its substance. The truth is revealed by a misstep and the fleeting sense that something beneath our feet rings false. The past bubbles out like molten lava, and lives turn to ash in its path.

This is a honeycomb world. Our actions echo through its depths.

Down here, dark life exists: microbes and bacteria that draw their energy from chemicals and natural radioactivity, older than the first plant cells that brought color to the world above. Every deep pool is alive with them, every mine shaft, every ice core. They live and die unseen.

But there are other organisms, other beings: creatures that know only hunger, entities that exist purely to hunt and kill. They move ceaselessly through the hidden cavities, their jaws snapping at the endless night. They come to the surface only when they are forced to do so, and all living things flee from their path.

They came for Alison Beck.

Dr. Beck was sixty and had been performing abortions since 1974, in the immediate aftermath of Roe v. Wade. As a young woman she had become involved in Planned Parenthood following the rubella epidemic of the early 1960s, when thousands of American women delivered babies with serious birth defects. She had progressed to outspoken membership of NOW and the National Association for the Repeal of Abortion Laws before the changes for which they fought enabled her to establish her own clinic in Minneapolis.