DNF @ 40% 
 The writing kept me engaged, but at almost halfway through, I'm starting to get bored by the constant action scenes. The action is well-done, but I honestly felt more interested at the very beginning when it was just the lives of the two sisters surviving in the apocalypse. 
 So, after a huge chunk of chapters that are absolutely nothing but a giant chase scene...the stakes of this story are shattered for me. I mean...the main character survives two motorbike accidents, an explosion, a car crash, and several rounds of automatic gunfire during these chapters. If she can survive all of that (with injuries, granted, but they barely slow her down) then I know she's going to survive literally everything else that the story will throw at her. 
 At least it was available for free. Nice, action-packed book candy to pass time, but I'm done with this one. Again, the action was engaging...but the stakes have been shattered for me.