Unusually for Poisoned Pen Press…a later title in a series that is free at the moment. PPP puts first titles free from time-to-time, and maybe second and third titles at a steep discount, but it’s rare to see a third title in one of the seres that they publish be totally free. You can see more about this in this previous post.
In any case, Deadly Odds, which is the third title in White’s Virginia Holmes series, is free right now (March 1, 2021).