This is the story of a letter that survived time to link together a centuries-long quest for liberty, a group of red-hot abolitionists, a British woman cloaked in scandal, and a Concord house tied to the Underground Railroad. Written by Senator Charles Sumner in 1860 and making its way to Concord via Barrow Bookstore, the letter leads one to ask, “What would you do for a cause in which you believed?”