The story so far: The gruesome discovery of a murdered girl’s skeleton in a cellar grave inside a Harrisburg row home triggers an exhaustive investigation in 1915. Yet, the young victim is never identified and her killer eludes authorities. Now, 106 years later, it’s the coldest of cold cases. But one amateur sleuth believes she’s close to solving it. Read Part One and Part Two.

As Carrie Donaldson walks down Harrisburg’s South 14th Street, it’s as if she’s venturing back through time, traveling more than a century into the city’s past.