Robert Todd Lincoln --The vitals

[RJNorton]

Thomas Keneally ('Lincoln') also refers to an anonymous letter sent to Lincoln saying Mary Lincoln may have had an affair with William S. Wood (Commissioner of Public Buildings) ... and we all know the worth of such . Kenally says Wood was required to accompany her on shopping expeditions (and presumably act as a brake).

I was aware Wood accompanied Mary to New York on a shopping trip. But I think they were not alone; there were several others in the traveling party. I cannot visualize Mary's shopping trip as an opportunity for an affair with Wood. Does the anonymous letter indicate where the affair took place?