This novel deals with time travel, but only of information. Mostly hard science, it also has a decent plot, good characters, and some humor. Though the author's vision of 2009 is a bit off (and check that cover computer!), it was still an enjoyable read - and a good fit for Leap Day.

I liked the characters; both male and female were different and solid. The mystery aspects of the plot were well done, though that takes a while to get rolling. The subsequent mystery felt tacked on, but the pandemic aspects ended up a good fit - and relevant today.

The author makes his case for information passing through time, though in a bit too much detail and for a few too many pages. The plot allows for it - characters explain to scientists, doctors, then government officials - but an infodump is still an infodump. Other aspects are left as just a mention - autonomous vehicles and vertical hop planes.

I would recommend this book. I believe I read one other James P Hogan book as a kid; will find out when I read it in the next few years.