Meet Grace Johnson, a woman dealing with life, death and a long-submerged secret. After she suffers a concussion, her memories return one by one, from present to past. Each reveals part of the slippery slope beneath her illusions of sanity stretching from light to dark to very dark.Grace imagines sitting beside her casket, wonders how others will remember her, glances toward the far corner of the church and sees . . . throbbing darkness.