Adriana Sinclair is an evolutionary mystery. Her blood type matches nothing in modern medicine. When a failed blood transfusion kills her twin sister, Adriana discovers she's a throwback to an original human that scientists have coined the "Mitochondrial Eve." Adriana is shocked to learn her strange blood type is her family's most protected secret. Working with spotty clues and partial facts, Adriana is determined to find the truth. Still reeling from her sister's death and the subsequent realization of her family's secret, Adriana struggles to put her life back in order and focus on her...