Army brats

When the Bailey family moves into an army base in Virginia there are a lot of adjustments to make; twelve-year-old Tom runs afoul of the base school bully, ten-year-old Charlotte finds herself trying too hard to make friends with the "cool" girls, and six-year-old Rosie is just being difficult as usual--but they come together to investigate a mysterious building full of weird cages, and uncover Fort Patrick's secrets.