Halo: Ghosts of Onyx (Halo #4) -

Ghosts of Onyx takes place in the 26th century, where humanity, under the auspices of the United Nations Space Command, has developed faster-than-light travel and colonized hundreds of worlds. Without warning, an alien collective known as the Covenant attacks the outer human colony of Harvest. The Covenant begin to hunt down human colonies, vitrifying the surface of each world. Humanity's best weapon against the technologically superior Covenant are the SPARTAN-IIs, supersoldiers equipped with powerful armor; unfortunately, there are too few of the SPARTANs to turn the tide of the war. Leia on-line: http://halo-klanok.gportal.hu/portal/halo-klanok/upload/593882_1316200501_01928.pdf