Ghost Sudoku — Kaye Morgan

After spending her vacation hiding from the media, Liza returns to find that the town has put her in the running for mayor. She has a feeling that the neighboring county and its dirty political machine are involved. When she turns to an old classmate to find out, she discovers that he's been murdered. A closeted Sudoku fan, he's left behind puzzles that may have hidden clues to what finished him off and who is trying to run Liza into the ground.