The Black Mamba

Blood is thicker than water, or so they say.
For Detective Billie McCoy, family has nothing to do with blood. She and her three best friends, Casey, Jane and Sarah, are sisters in every way that matters. So when Casey's long-lost cousin Jill suddenly turns up, she is welcomed with open arms.
But Billie's instincts won't stay quiet. A police sketch of a wanted robber bears an unsettling resemblance to Jill, and the timing of her arrival feels anything but accidental. Is Jill really here to rec...