A tiny piece of raw flesh attached to a fingernail, found in a pool of bloody mud, exonerated three men and convicted the real murderer.
This episode, drawn from Hans Gross's 19th-century forensic handbook, details the critical importance of finding, preserving, and interpreting traces of blood at crime scenes. It explains how bloodstains can vary in appearance, provides case studies where blood evidence proved decisive, and offers practical guidance for investigators on search techniques and evidence handling.

As heard by us

A patient manual on reading bloodstains without guessing.

This chapter treats bloodstains as practical evidence, not theory, and keeps attention on where they can turn up: floors, walls, furniture, and even a cellar ladder. Its main strength is the method.

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Why you'd press play

Follow the blood, but only after you have lit the room properly.

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