How It All Started

Ava Smith was freshly out of college when she ran into a young girl stealing a woman's purse. A week later she finds that the young girl she met has been killed. She starts doubting Saph's murder when a friend of Saph's thinks that Saph might have faked her death. Is Saph dead or is she faking it? Why would she fake it though?
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Should Ava help figure out why Saph's friend thinks that Saph faked her death?