City of Secrets (The Lost Waterbender sequel)

It's been 12 years since the 100-year war. But there's still work to be done. Badger and the gang have been watching the city grow and flourish, but it's not all prosperous. When several crimes drive Badger to investigate, she finds herself entangled in a twisted plot darker than anything she ever could have expected, endangering her and those she loves.