When writing, I sometimes get confused with the past perfect tense-- specifically when to stop using it and switch back to simple past even when we are still talking about something that happened prior to the narrative past. Take the following example. I walked into the room. She was sitting there, looking pale and tired. I noticed the cigarette burn on her shirt. "Are you using again?" I asked. "No." She replied. I did not believe her. That morning I had called. Her voice had sounded distant. There had been long pauses between my words and hers. Or I did not believe her. That morning I had called. Her voice had sounded distant. There were long pauses between my words and hers. Is one of these right / the other wrong. I have been told that once the time has been clearly established, it is ok to switch back from past perfect to past. Are both these sentences ok?