How should a police force treat an impossible witness?
What the books establish
Peter’s first case begins when a murder witness is a ghost, bringing him to the Folly and to a different kind of evidence. Read the rivers of london case file · Audiobook edition and synopsis (opens in a new tab)↗.
What’s still open
What standards would let an ordinary court assess a statement that only a practitioner could obtain? The book introduces the problem through Peter’s case rather than publishing a general legal manual.
Theories fans discuss
One reading is that the Folly protects conventional evidence chains wherever possible. Another is that magic will eventually force a more explicit institutional rule. These are interpretive possibilities, not established policy.
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