With everything from engineering issues, to super powerful beings, planets to discover and clues to put together that lead to a satisfying finish, this is classic Star Trek at it's best. The writer knows his Trek characters well and includes references to past exploits to shape behaviour. With Scottie, the STNG crew and a few Reg Barclay moments in the mix, this book is enjoyable.
I gave it 4 stars because of its rather drawn out ending - it could have finished about a chapter or two earlier - and because sometimes it oversimplifies conversation - using conversation as a device to explain things almost in a text book fashion (much like early Heinlein) - and romantic relationships are very oversimplified - but what Trek book (excluding Imzadi), does romance well? Finally, the 3 main ideas that run through this book could have been made into 2 Star Trek books rather than 1 and I feel it would have made a better 2-parter series which was slightly longer and made more of it's ideas.
Overall, it is a good read, fast paced and with plenty of twists and turns. Hence the 4.