Double Crossed in the third Almost Identical book and I think it is best one ever!  At first I had no idea how I missed the March released of this one, but then I remembered I was in the hospital then.  That would be the only reason I can see behind me missing this third book.  I love this series.  It is so perfect for tweens.  Lin Oliver really has a great thing going here!  This one is told from the POV of Sammie, the Truth Teller twin.  In this one, Sammie's friend, Alicia, has two cousins visiting from El Salvador.  Reaction from the SF2s is about what you would expect and really addresses some serious issues.  This series is perfect!