popular ! When No One is Watching by Alyssa Cole

“Sydney Green is Brooklyn born and raised, but her beloved neighborhood seems to change every time she blinks. Condos are sprouting up like weeds, FOR SALE signs are popping up overnight, and the neighbors she's known all her life are disappearing. To hold on to her community's past and present, Sydney channels her frustration into a walking tour, and finds an unlikely and unwanted assistant in one of the newly-released arrivals to the block-her neighbor Theo.
But Sydney and Theo's deep dive into history quickly becomes a dizzying descent into paranoia and fear. Their neighbors may not have moved to the suburbs after every, and the push to revitalize the community may be more deadly than advertised.
When does coincidence become conspiracy? Where do people go when gentrification pushes them out? Can Sydney and Theo trust each other-or themselves long enough to find out, before they, too, disappear?”