Legend by Marie Lu

This is another first book in a teen dystopia series.  Day is a loner rebel who the current government wants captured and executed.  He is causing so much trouble.  June is a prodigy about Day's age who is highly trained by the government as a spy, assassin guard etc.  She loves to go off on her own to challenge herself, something government training cannot do, she is so advanced.  Their worlds collide when Day pulls off a heist of plague medicine in which June's beloved brother is killed.  Plague pops up in one poor sector or another with no real sense as to why.  Victims' doors are marked and the medical police cart them away.  Occasionally a different sort of mark is placed on a door, though no one knows the significance.  It is known that there is cure and prevention for plague but only wealthy people have access to it.  There are other horrific things this government is doing.  Kids who fail their training trials at aged ten are theoretically sent to labor camps and are never seen again.  June is assigned the task of finding Day and bringing him in.  She is highly motivated to do so by the loss of her brother.  When she succeeds, she is already seeing things a bit differently.  She even seems to have fallen in love with Day.  His capture results in the death of his mother and the capture of his brothers as well.  Day's execution time is set.  But before then, June has discovered the truth about her brother's death, the plague and other things the government is doing and sets out to free Day and his brothers instead.  At story's end Day is freed, one of his brother's is dead, June has become a rebel and there is still Day's younger brother to rescue.  This book just sets up the series.  Anyone reading this will really want to read the next books.  Think about the Nazi regime and their labor camps and other stuff that regime did.  I suspect that this is where the story is going - though I will have to find out along with everyone else.  Its an easy enough read, I recommend it.
JDW