'The second book in the trilogy opens with Sal and Shilly heading for the
Interior, fleeing the Alcaide and the Syndic and following the only
clue they have: the name of Lodo's old teacher, Skender Van Haasteren.
As hinted in Sal's dream, they are followed by Tom's brother, Tait, and
his senior Sky Warden, Shom Behenna, the new Selector for the Fundelry
region. Sal knows they are being pursued. He and Shilly have no choice
but to use their incomplete training in the Change in order to survive.
The tension between Behenna and Sal is a central dynamic of the book
with Behenna (the Sky Warden of the title) regarding Sal as his means of
rising rapidly through the ranks, and Sal seeing Behenna as a symbol of
everything from which he and Shilly are fleeing. It slowly becomes
apparent that Sal is the focus of a bitter tug-of-war between several
rival factions of a secretive group called the Weavers, and Sal's
relationship with Shilly is also tested as he is unsure of what he feels
for her'. Source: publisher's website.