Best Kept Secret is the second novel in Debra Moffit's Pink Locker Society series.
At the end of Only Girls Allowed, the Pink Locker Society was shut down by the principal of Margaret Simon Middle School, due to hacking by two jealous classmates. But Jemma, Piper, and Kate won't be kept down! The Pink Locker Society is back in operation. But this time, they're running the show from the spooky school basement, without any adult help. They'll discover why the society was shut down years before, and learn that they'll need to watch their backs to stay afloat this time around.
All the while, Jemma is dealt a rude awakening when her beautiful best friend, Piper, secretly asks Jemma's crush Forrest to the annual Backwards Dance. Will Jemma and Piper resolve their differences? And will the Pink Locker Society survive?