Rachel Montgomery, the sister of intelligence analyst, Jess Montgomery, placed a cryptic call for help on Jess's phone.She doesn't call again.Terrified for her sister and what she might be facing on the roughest streets in Boston, Jess begins a desperate search for Rachel. What Jess finds drags her into a web of murder, lies and addiction, forcing Jess to face her past and rely on her instincts. But can she get to Rachel in time to save her?