2017 Reading Challenge discussion

Also a book that could count as being published in 2015, this book continues the saga of the teenaged aliens who have to defend Earth from what has become a universal enemy: the Mogodorians led by Setrakis Ra. I am not sure if having the luxury of reading the first 5 together made reading this 6th one a let down, but I am starting to lose interest. I'm hoping the teenaged readers in my library don't.