This is the 3rd in the House of Niccolo series (the first two being Niccolo Rising and Spring of the Ram), and Nicholas/Claes is now both an adult and yet also tempted back into the irresponsibility of his miss-spent youth. Free of his company and previous emotional entanglements, he tries to join his mercenary army fighting for control of Naples but instead finds himself being enticed, seduced and enforced to take sides in the deadly struggle between the Lusignan siblings for control of Cyprus. But everytime he thinks he has left his past behind, it rears back up to trap him, even in Cyprus; and even emotional closures, however incomplete, cannot leave him at peace.
If you haven't read Dunnett before then you really do need to start at the beginning of the series, but this is a far stretch from the average `historical' (Chadwick, Gregory etc.). The plot is compelling, intricate and twisted and nothing is ever quite what it seems. Nicholas is both a charismatic hero and yet also an enigmatic one, and the over-arching plot arc of the series is as much about exploring the depths of one man as it is about his world. And that world is a fully-realised C15th one, where empires are being built as well as industries (banking, commodities trading), and where people eschew the sentimentality and politically-correct C21st mores of so much `historical' fiction and instead live the harsh, violent reality of a Europe (in this book) emerging out of its medieval roots and into what will later be known as the renaissance.
This isn't an easy read but, as with all Dunnett's work, is a completely engrossing one. Very highly recommended.