As their investigation picks up pace, Sam and Mac land on the trail of a former Baltimore cop with the menacing-sounding nickname of Mad Dog—someone they’ve been told might have insider intel about the rumor. And after parsing a 1997 police report from the Ripken residence for clues, Sam and Mac head for the wealthy Baltimore exurb that appears to have more horses than people. Meanwhile, Sam reveals his intimate connection to the Kevin Costner oeuvre.

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