In book 4 of this fantasy series Kaylin is again battling for the life of a child, this time a Leontine cub who; according to the law of his species, should never have been born. She is also trying to save the life of Marcus, her mentor and friend, attempting to rise above the petty behaviour of the new Hawk Sergeant who badly wants to fire her and avoiding any potential possibility of a meeting with the Emperor; a sensible decision considering his tendency to eat anyone who annoys him.
Established characters Severn, dragons Sanabalis and Tiamaris, and Nightshade; an immortal Barrani, feature significantly in the plot, as does Marcus. Although more is learnt of his personal life and the Leontine species as a whole, this book does not centre on the Leontine race as predominantly as previous books have dealt with the Tha'alani or the Barrani. Instead this book also deals significantly with the growing racial hatred towards the Tha'alani following their misunderstood actions at the end of book 3 and Marcus' current circumstances.
The pace is almost frantic in places, and whilst the ideas introduced are clever and original, I was left feeling somewhat lost at times; fumbling a little to grasp exactly what the author meant. That said, Kaylin remains a likeable, gutsy character with plenty of empathy and a bloody-minded tenacity to solve a case or save a life. She has enough sass and humour, plus an amazing ability to ask the most inappropriate or random question at any given time, which keeps her fresh and entertaining in the fourth book of this series. MS is also a master of a spectacular ending, and "Cast in Fury" definitely has a wonderful finale.