Three Days Till Dawn. Antiquity's Gate, #1

Antiquity's Gate forced two realities to collide-what followed tore one of them apart. An Antarctic city of domes is the last safe haven for survivors, held together by a tenuous peace between the remnants of humanity and the Therans who rule over them. A mid-level systems operator, Ripley does his best to stay out of trouble. His best friend Felix, an irreverant half-breed shunned by society, can't seem to do the same.
When Felix's family is targeted by an unjust law, there's nowhere to run. In a desperate bid to escape, Ripley and Felix uncover a conspiracy that will mean the end for their city. But tangling with fate has a heavy price. The people of Sanctuary have never seen a sunrise. If Ripley and Felix aren't prepared to make the ultimate sacrifice, none of them ever will. This sweeping post-apocalyptic dystopian series explores the depths of friendship and betrayal in a city teetering on the edge of two worlds.