Savannah businessman Charles Lamar on Nov. 28, 1858, became the first person in 40 years to land a slave ship on American soil. That event is the subject of Jim Jordan’s new book, “ The Slave-Trader’s Letter-Book: Charles Lamer, the Wanderer, and other Tales of the African Slave Trade .” Jordan was able to reconstruct the story because he got his hands on valuable research material — Charles Lamar’s own letters, which most historians didn’t even believe existed.