Predator's Gold is book two in the Mortal Engines Quartet. Written as a YA book, it is easy to read, enjoyable, and has plenty of betrayal, violence, death and now a little romance.
The book is again about the journeys of young Tom (now age sixteen) and Hester and their struggle to stay alive. Reeve sends our couple to the moving ice city called Anchorage that is governed by a young margravine by the name of Freya. It is her job to keep the city moving, getting her directions from the ancient ice gods, but being the last in her line and most of the city lost to a plague makes things difficult. Reeve does a good job of making sure that where ever Tom or Hester goes gloom and despair is sure to follow.
But enough of the spoilers. If YA fantasy/science fiction is something you're looking for, then search no more. The 2nd book in the Mortal Engines Quartet series is worth reading.
Predator's Gold by Philip Reeve
Mortal Engines Quartet series book #2.