As the Shen's prepare for Harmony Dumplings' grand reopening, they learn that they have become the latest victims of a crime wave that has hit their Chinatown community. As Nicky and the team prepare to take matters into their own hands, a run-in with a vigilante named Bo leaves Nicky wondering who this mysterious stranger in her city is. Elsewhere, following the legal fallout from her app, Althea and Dennis move back in with Mei-Li and Jin, and Ryan and Sebastian adjust to living together, while juggling their busy schedules. Finally, the unexpected arrival of someone from Nicky's past rocks her to her core.