Mr. Grace sold the estate to a developer in the 1980's.
Mr. Grace said police officers and athletes had formed a human chain to pull people out of the river.
Mr. Grace, who has been ill in recent years with cancer, is 81.
Mr. Grace called it "throwing himself on the grenade" for the good of the team.
Mr. Grace said this situation would eventually cause widespread dissatisfaction among clients.
Mr. Grace starts with a photograph of his subject.
Mr. Grace, who is 76 years old, said yesterday that he still had no plans to retire.
Mr. Grace concedes that events could change, although the current plan is to choose one of the three.
It would not be the first time that Mr. Grace has taken the company in a new direction.
Mr. Grace was 32 when he took over in 1945 after his father suffered a stroke.