Way of the Pilgrim

"Imagine an Earth totally dominated by an alien race. Imagine that humans and their technology are completely powerless against these invaders. Imagine a world in which people are nothing more than cattle to their new masters Now imagine that one man discovers a key that might free mankind, but he must learn how to care and how to love before he can believe in that key."@en
"The Aalaag, a powerful race of alien giants, have conquered Earth. Shane Evert is one of the privileged caste of couriers who serves them, but in his heart the sparks of rebelliousness will not die."
"Earth as been conquered by a powerful alien race, and the human underground is preparing to rebel. "Shane, a profoundly gifted human linguist, has spent his life learning the aliens' language ... [but] one day, in a rebellious moment, he invented the Pilgrim, a mysterious figure who incites rebellion all over the Earth and vanishes unseen, leaving a distinctive graffiti tag behind him."--Cover."