4x04 Nine Lives
First Aired: Apr. 30, 2007 on BBC One
Summary: A family feud erupts when a rich, lonely old woman, Dorothy Hepple, is found dead in her home, as the drama about a team of unconventional detectives continues. She leaves all her money and property to her beloved cats, rather than her nephew, Harry, and niece, Caroline. Her body lay…
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Det. Supt. Sandra Pullman: It's a cat.
Brian Lane: Do you know why their tongues are all rough? Because they're covered in sharp points, for stripping meat from bones.
Det. Supt. Sandra Pullman: Fascinating.
Brian Lane: They've also got teeth that are designed for cutting and shredding, and retractable claws for pinning down prey. And people keep them as pets!
Det. Supt. Sandra Pullman: Any of that relevant, Brian?
Brian Lane: Yes. Know thy enemy.