Ambassadors

Free to read here, from Project Gutenberg.

Joan of the Sword Hand

S. R. Crockett

The Divine Lady: A Romance of Nelson and Emma Hamilton

L. Adams Beck

The Ambassador

Sam Merwin, Jr.

On the manner of negotiating with princes

Monsieur de Callières

The Lost House

Richard Harding Davis, also an audiobook

The Ambassador's Pet

Randall Garrett and Robert Silverberg

Mind Worms

Moses Schere