Faye seems like an obvious choice — she's gloomy, obsessed with dark magic, and her mom had the hots for John Blackwell. But on the other hand, she's terrible at doing solo magic (squib alert!). That leaves Melissa and Diana, both viable options. Diana and Cassie have a sisterly bond that could definitely be blood related, and Melissa had a strange connection to Blackwell while they were mixing herbal tinctures in the clubhouse.
Each of these ladies has a strong case for why they might be Cassie's sis, but it’s time for you experts to voice an opinion. Who is Cassie's long-lost sister from a mutual mister?
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