Caster

"Aza Wu, who knows that real magic is dangerous and illegal, as casting killed her sister, Shire. As with all magic, everything comes at a price. For Aza, it feels like everything in her life has some kind of cost attached to it. And now with Shire dead, Aza must step in to save the legacy of Wu Teas, the teahouse that has been in her family for centuries"