For ten points, name this Henry James novel which sees Madame de Vionnet supposedly poisoning the culture of Chad Newsome, which prompts a rescue by Lewis Lambert Strether.
One lawyer in this novel has a "sacred rage," while another character responds to all nonsensical things with "Oh, oh, oh!"  In the ninth book, the protagonist imagines himself in a sunken boat, and he had failed [?] Gloriani's test to see if he blends into society. The protagonist confides in Bilham and meets an associate of Mamie at the Notre Dame Cathedral, which gives him the resolve to ignore a telegram telling him to return home, prompting Sarah Pocock to come to Europe. The protagonist travels with Mr. Waymarsh to serve in the title occupation for his beloved. For ten points, name this Henry James novel which sees Madame de Vionnet supposedly poisoning the culture of Chad Newsome, which prompts a rescue by Lewis Lambert Strether.
One lawyer in this novel has a "sacred rage," while another character responds to all nonsensical things with "Oh, oh, oh!"  
The {Ambassadors}