Metru Nui - Orkahm
In the time before time, Metru Nui, city of legends, faces danger unlike any it has known before. A mysterious and powerful menace threatens the city, striking from the shadows and then disappearing, leaving rubble in its wake. Six Matoran hold the keys to its defeat, but they have disappeared! Worse, one of them has been touched by darkness and plots against all of Metru Nui.
As chief Ussal rider, Orkahm knows all the hidden streets and alleys of Le-Metru. Now a secret he discovers will plunge into the middle of a plot that threatens all of Metru Nui!