"Heist Society" by Ally Carter (YA fiction)

"Heist Society" would be an excellent selection for middle school students.  It is a lighthearted romp through the seamy underworld of art thieves, but with a twist.  This time the art thieves are teens!  Kat's father is one of the greatest thieves of all time, and he is the prime suspect for stealing a mob boss's prized art collection.  In order to get it back, the mobster threatens Kat with her father's life.  Only Kat's dad didn't do it...he was committing another heist at the time of the theft, but no one believes him.  Kat assembles a motley crew of teens and they figure out who has the paintings, where they are and plot to steal them back.  However, there is more to the story than meets the eye!  Read on dear readers to discover all the twists and turns!