Book excerpt: Plots within plots ratchet up the intrigue in this week's installment of Tremontaine, the episodic web series set in Ellen Kushner's Swordpoint universe. A moment of staggering inspiration and insight sets events in motion that have the potential to fracture friendships, shatter alliances, and remake the balance of power in the city . . . and the world. As Micah explores the implications of her discovery, and Rafe moves quickly to exploit them, Kaab is faced with a calamity that threatens not only her own future, but that of her family and the Kinwiinik people. This episode is brought to you by Paul Witcover, who comes at the changing of the tides to throw our heroes for a whirl.