The Girl with the Dragon Tattoo is the first in Stieg Larsson’s Millennium series. It’s £0.99 at Kindle UK today as part of the UK Daily Deal.
Buy at Kindle UK
And the first in the continuation of the series by David Lagercrantz, The Girl in the Spider’s Web, is also £0.99 right now.
Buy at Kindle UK
An omnibus of the first three titles in this series, the ones written by Larsson himself, is £0.99 at Kindle UK today: https://www.amazon.co.uk/dp/B01CUJA454
The titles include: The Girl with the Dragon Tattoo, The Girl Who Played with Fire, and The Girl Who Kicked the Hornets’ Nest
This omnibus (with the first three titles in the series) is £0.99 again at Kindle UK. The link in the comment just above is still good.
Today’s Big Deal at Kindle UK is the first six books in the Lisbeth Salander/Millennium series for £0.99 each: the first three by Stieg Larsson and the next three by continuation author, David Lagercrantz
Big Deal page at Kindle UK (includes some books by other authors): https://www.amazon.co.uk/s?rh=n%3A4725112031&fs=true
After being continued by David Lagercrantz for three books, now apparently Stieg Larsson’s Lisbeth Salander series is being carried on by Karin Smirnoff. And the new (2023) seventh book in the series, The Girl in the Eagle’s Talons, is on sale in the UK right now for £0.99. I don’t follow this series, so can’t comment on whether the follow-on books are any good…
Kindle UK: https://www.amazon.co.uk/dp/B09X3CDG91
Kobo UK: https://www.kobo.com/gb/en/ebook/the-girl-in-the-eagle-s-talons