National Public Radio: KELLY MCEVERS, HOST: Now we bring you the story of an investigation. Cue the "Magnum, P.I." music... (SOUNDBITE OF SONG, "MAGNUM, P.I. THEME") MCEVERS: ...Because yes, this involves the famously mustachioed star of the '80s series, Tom Selleck. ROBERT SIEGEL, HOST: Over a two-year period, trucks have been taking water from a hydrant outside Los Angeles to a sprawling property in Hidden Valley. MATT HAMILTON: Mr. Selleck, for the past three decades, has lived on a 60-acre ranch there, which...