There are 2 books in the Firefall series. The newest book is Echopraxia which came out in 2014.

1
Blindsight

Book cover of Blindsight
Two months have past since a myriad of alien objects clenched about the Earth, screaming as they burned. The heavens have been silent since until a derelict space probe hears whispers from a distant comet. Something talks out there: but not to us.Who should we send to meet the alien,…
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2
Echopraxia

Book cover of Echopraxia
It's the eve of the 22nd century and the beginning of the end.

Humanity splinters into strange new forms with every heartbeat: hive-minds coalesce, rapture-stricken, speaking in tongues; soldiers forgo consciousness for combat efficiency; a nightmare human subspecies has been genetically resurrected; half the population has retreated into the ersatz…