After saving her father and the world, twelve-year-old Lola Benko and her new best friends, Jin and Hannah, are a true treasure-hunting team. But after botching a huge job, they are looking to redeem themselves.

They decide to try their luck at Camp Timberwood, where teams will compete to join the legendary Task Force, a group that gets plumb assignments around the globe. When their former nemesis, Lipstick, shows up unexpectedly, she makes an offer they can't refuse: help her find the legendary Helm of Darkness and she will help them come out on top in the competition--and be the first team in line for the Task Force.

They just have to go to the mysterious Midnight Market, where the Helm is rumored to be. But Lola, Jin, and Hannah still aren't fully back in sync after their recent failure. Can they prove to the Task Force--and themselves--that they still have what it takes?