cover story

noun
1
the main story in a magazine that goes with the picture shown on the front cover
داستان جلد, داستان روی جلد, مقاله روی جلد
2
a story that is invented in order to hide something, especially a person’s identity or their reasons for doing something
داستان پوششی, داستان ساختگی, داستان جعلی, داستان انحرافی
The guard believed her cover story.