Oathbreaker

Halfdan and his master, Winston the Illuminator, are guests in a monastery when they're awakened in the middle of the night and asked to solve a crime. A monk praying in the church has been brutally murdered, and his severed hand offers the first clue of a motive. As they investigate who could have committed such a heinous atrocity, and why, Halfdan and Winston must negotiate bitter rivalries within the monastery's hierarchy, a sensitive class structure, and the tension between the new laws King Cnut has sworn to uphold and the codes of honor that precede them.