Someone or something was in this room, something or someone with the power to make people forget. … He was reaching for the stunner on his desk when something caught his eye. It was the dossier for Matthew Keller, senior. A crude drawing defaced its yellow cover.
Two open arcs, joined, in black ink. Three small closed loops beneath.
The bleeding heart. It certainly hadn't been there before.
Jesus Pietro opened the folder. He could smell his own fear, and feel it, in the cool perspiration that soaked his shirt. As if he'd been afraid for hours.

Ch. 11 : Interview with the Head - A Gift From Earth (1968)