This book carries on from Polar City Blues. It contains most of the characters from the first book and has them unconvering another plot that could affect the independent human Republic planets caught in the tenuous and delicate stalement between the huge, antagonistic power blocks of the alien Interstellar Confederation and the Coreward Alliance.
The book is well written and I found myself unable to tell that it had been written by two authors - their writing styles blended together very well in my opinion. I have to admit I was worried when I saw that the novel was a collaborative effort, but Kate Daniel did a really good job of writing within the Polar City Universe.
I love Katharine Kerr's novels because of the huge amount of detail she puts into creating/describing both the characters and the settings. For example, the plausible linguistic developments she puts into her books, both with this series and the Deverry books. At times the characters in these novels speak a future projection dialect of the English spoken in Southern California today. Don't let that put you off as it is very easy to understand. If you can understand the guests on the Jerry Springer Show you can understand the characters in this book.
The reason I'm giving it only 4 stars is: there is far too much baseball and baseball related stuff in the novel. I hate baseball and consequently didn't enjoy those parts of the novel.
If you enjoyed Polar City Blues and want to find out what happened to some of the characters you will enjoy this novel. If you want to read an intelligent, well thought out and plausible SF novel with very enjoyable and believable alien characters you will enjoy this too.