BCBook Cover
Intelligence
Import covers
All trendsMeasured tag / mysterious
mood / insufficient

Mysterious

All markets · 90-day comparable periods

+7.7percentage
points
Current prevalence7.7%2 matching covers / n=26
Previous period0%0 matching covers / n=0
Signal stateinsufficientRule-based classification
As ofAug 30, 2026Latest evidence check
01 / Current window

Observed prevalence

Jun 16n=0Jul 1n=5Jul 16n=5Jul 31n=5Aug 15n=5Aug 30n=6

Empty time buckets are shown as zero and retain their sample size; they are not interpolated by AI.

02 / Market separation

Source breakdown

Amazon Bestsellers2 / 825%
Amazon New Releases0 / 60%
Traditional Publishers0 / 60%
Indie Authors0 / 60%
03 / Underlying evidence

2 matching covers.

These are the records counted in the current prevalence numerator.

04 / Evidence interpretation

What it may mean.

Deterministic previewevidence-interpreter-v1
exploratory confidence
Interpretive summary
Mysterious increased from 0% to 7.7% across comparable 90-day windows, a 7.7 percentage-point upward movement. The current matches are concentrated in Amazon Bestsellers.
Market context

Amazon Bestsellers has the highest current prevalence at 25% (2 of 8), while Indie Authors is lowest at 0% (0 of 6).

What to investigate

Inspect the matching covers alongside non-matching covers from the same source types. Look for whether mysterious co-occurs with particular typography, imagery, colour, or subgenre choices before treating this as a durable convention.

Facts supplied to the interpreter

Current window: 2 matching covers from a sample of 26.

Previous window: 0 matching covers from a sample of 0.

7.7 percentage points of measured upward movement.