3 Rat Cat 3 - Part 2

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C.I.D.
14th October 2005 20 mins Season 1 Episode 387

A strange ring is found. When scanned, CID find that it has an extra coat on it hiding a phrase underneath saying, "3 Rat Cat 3". When Max hears this phrase in the hospital, he immediately dies of shock. What does this phrase mean?

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