The Serpent's Tongue (2012)

When Simone and her best friend, Star, discover an old chest, it reveals Simone's secret family history, one of black magic and murder. Taking a necklace from the chest, Simone soon realizes that a voice from the necklace is whispering promises that are too tempting to ignore and she finds that the choices of right versus wrong and good versus evil are not as clear as they once were. Succumbing to the seduction of the necklace, she must choose whether or not what she's been promised is worth the price of betrayal and murder. As Star discovers the truth about the changes in Simone, she realizes that saving her friend may result in her losing the one thing she has always wanted.