Pelgrane Press's The Esoterrorists bundle is for one of their early Gumshoe System RPGs.

PELG-01 The Esoterrorists 1E (2006)
PELG-03 The Book of Unremitting Horror (2007) - monsters
PELG-04 Six Packed (2007) - adventure
PELG-05 Albion's Ransom 1 - Little Girl Lost (2007) - campaign supplement
PELG-06 Profane Miracles (2008) - adventure
PELG-07 Dissonance: Music for Esoterrorists (2008)
PELG-08 The Esoterror Factbook (2009) - rules/setting supplement
PELG-10 The Love of Money (2011) - adventure
PELG-12 The Esoterrorists 2E (2013)
PELG-13 Albion's Ransom 2 - Worm of Sixty Winters (2013) - campaign supplement
PELG-14 The Esoterror Summoning Guide (2013) - background and adventure
PELG-16 Worldbreaker (2016) - campaign supplement

This is all the regular Esoterrorists books published so far so a complete set for $19 is quite nice. Ends tomorrow so bought it.