After the Scottish setting of Game of Kings, Queen's Play moves to France and the French court of Henri II and his queen Catherine de Medici. Someone is trying to kill the young Mary Queen of Scots who is betrothed to the Dauphin, and Lymond, working secretly for Mary de Guise, is there to stop the plot. Poisonings, love affairs, crazy races through the rooftops of paris - and Lymond comes close to falling in love.
This is also the first book where the Dame de Doubtance appears who is an important character throughout the series, and also introduces Archie Abernethy, one of Lymond's truest friends and spiritual father.
I can't say how wonderful this whole series is, and would give all the books a 10-star rating if I could!