Domino — Phyllis A. Whitney

She had run screaming from that house as a child. And ever since that night, Laurie Morgan had been unable to remember the blind terror that drove her into the darkness. It was frightening to have her whole childhood erased from memory. But the real horror started when she began to remember...
A trembling had begun deep inside me as the old sense of spinning started in my brain. I was whirling, whirling into oblivion. It was as though I could hear the amplified explosion of a gun going off in this room, echoing down through time. I could hear the dreadful impact of a bullet on flesh, see the dazzle of light on the gun. And the blood--spurting.

A voice belonging to the present reached me from the doorway. It was Gail. "You remember now, don't you, Laurie? Why not pick up that derringer? Pick it up and hold it the way you did that other time. Put your finger on the trigger and pull. Go ahead--fire it. You want to, don't you..."