i just became aware of a new book from our Canadian champion Evgeny Bareev. It looks like it came out just over two weeks ago and if it is not yet available at Strategy and Games, I'm sure it will be soon. It appears to be a position and game collection grouped by theme with chapter headings:

Play Without Castling
A Queen Behind Enemy Lines
When A Piece in the Center is Grim
A Piece Down in a Worse Position
At the Edge of the Board
Killer Delayed Castling
Rewards of Doubled Pawns