This is the best I've read so far from Lisa Harris. If you like the romantic suspense writing of Dee Henderson and Irene Hannon, you will like Dangerous Passage.
The characters were well-developed and believable and the story deals with a problem that has become epidemic in our society and pandemic in our world. To avoid a spoiler, I won't mention it specifically, but that element of the plot kept me interested. Personally, I like my stories a little faster paced and with more action. However, the action and pace did pick up about half way through the book and it kept me turning the pages from that point on. Since I can't give it 4.5 stars, I'll give it 5.