The vagrants often would knock on doors and beg for money.

CNN: Slain student called 911, but no one came in time

When the Kittredge house is burglarized in a crime wave that the newspapers are blaming on vagrants, the plot becomes a mild mystery that Kit tries to solve for the sake of her young hobo friend Will (Max Thieriot).

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From its humble beginnings (for a while, the fire-fighting force consisted largely of drunks and vagrants) the service gradually became more professional, developing new techniques and introducing smokejumpers (special teams that parachute into hot spots).

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During the investigation, police have tracked leads pointing to vagrants in Zimmerman's off-campus neighborhood.

CNN: Slain student called 911, but no one came in time