Surprisingly good. It didn't feel dated even at 10 years. Cassy (Dr. Cassiopia Richards) is drawn into a continuing investigation of her father's murder and theft of a deadly toxin that happened 4 years prior. Gabriel Lowe was the military security assigned to protect her father but instead thought to have killed him. The suspense was good, well-paced and believable. We are in on the action throughout the story as Cassipoia and Gabriel stay one step ahead of the person trying to find the missing toxin and murdering anyone who gets in the way. I really liked the dialogue between the MCs - snappy and fast-moving. Their relationship moves fast also, but always makes sense.
This is another older book that I really wish the author could go back and revise - adding 50-100 pages. The overall pacing of the book is good, but we could get a bit more description, more backstory on some of the supporting characters (who mostly all end up dead), and definitely more of the motel room scenes - wink, wink.