Revelation by C. J. Sansom

In March 1543, while London buzzes about Henry VIII's campaign to win newly widowed Lady Catherine Parr for his sixth wife, hunchbacked barrister Matthew Shardlake has grimmer matters on his mind in Sansom's gripping fourth Tudor historical (after 2007's Sovereign). Not only has his close friend and colleague Roger Elliard been savagely murdered but Shardlake finds himself assigned the incendiary case of a young religious fanatic committed to Bedlam.