I hadn't read this book since it first came out in 2002 and it only solidifies my opinion that DeCandido is one of the most underrated Trek writers. His works need to be thought of as highly as Peter David's, whose Trek writings I hold as the Gold Standard for Trek books.
This is the second and final book in a series, but the previous book need not be read to understand this novel.
Split into two separate, yet joined, tales, the first deals with Tuvok joining the Maquis to locate the newly discovered third of the Malkus artifacts, indestructible ancient devices that can destroy worlds. A member of the Maquis has found the weather controlling device and is killing all Cardassians in the DMZ in revenge for killing his spouses. Cal Hudson and his Maquis crew join with Chakotay and his to find this possessed rebel, with Tuvok assisting as well. Great action, stellar characterizations, and fabulous justification for showing how the Vulcan was able to infiltrate the Maquis before the events of the first episode of Voyager.
The final tale has the last device found, leading to possession of all the previous characters who touched the artifacts, including Spock, McCoy, DeSoto, Kira, and others. Malkus is attempting to unite the devices and reclaim his hold on the galaxy. Picard and the crew of the Enterprise join with the crew of the I.K.S. Gorkon and Captain Klag to stop his despot. Much of the adventure follows the Klingons and DeCandido excels brilliantly with these established and new characters. Great adventure and conclusion.
I was left wanting more of Klag and his crew and wondering why Paramount doesn't go to DeCandido to use his characters for a "classic" Klingon film or series. It would be glorious.
This is an absolutely recommended read for Star Trek fans.