HISTORY DETECTIVES steps into a family dispute: Was this picture frame crafted from the staircase banister of the Titanic, the Lusitania or neither? Then Tukufu Zuberi wonders whether Woolworth signs were part of the scene at the 1960 Winston-Salem lunch-counter sit-ins. For 70 years, toy soldiers have haunted their owner with a question: Was the father of his childhood friend a Nazi spy? Then, a journal full of liquor recipes makes another man wonder if his uncle was a prohibition bootlegger. (5 of 9)