Unremembered Empire makes you almost up to date in terms of that story line.
This site has all the books, including audio dramas and novellas and such.
http://wh40k.lexicanum.com/wiki/Horus_Heresy_Series
Vengeful Spirit and Sedition's Gate came out in 2014 and I have not read them yet.
However, I would also suggest going back and reading some of the other books--they're good, and some of them like "Thousand Sons", "Mechanicum", "Legion" and "Prospero Burns" (not to mention "Angel Exterminatus" which is excellent) are pretty key to plot of the whole Heresy.
But here's a shot of the books in their "original order" at least up to #20.