IN THE BLOOD by Lisa Unger

Good book.  Surprise ending.  When Lana Granger gets her first grown up job she finds her young charge a force to be reckoned with so to speak.  But are things really as simple as they should be?  When Lana's roommate disappears does Luke, her young charge, know anything about it.  He seems to be on a path to find her roommate, Beck.  But the police suspect Lana after looking into a past friend's death.  There is a surprise at the end I sure didn't see coming for quite a while into the book.  I wasn't sure who was writing in the diary; it could have been Rachel, Lana or Lana's mother who was murdered.  That could be the answer to all of the mysteries.