Someone Else’s Life by Katie Dale

When seventeen-year-old Rosie's mother, Trudie, dies from Huntington's disease, Rosie's pain is intensified by the knowledge that she has a fifty percent chance of inheriting the crippling illness. Only when Rosie tells her mother's best friend, "Aunt Sarah," that she is going to be tested for the disease does Sarah, a midwife, reveal that Trudie wasn't Rosie's mother after all. Rosie was swapped at birth with a sickly baby who was certain to die. Devastated, Rosie decides to join her ex-boyfriend on his gap-year travels, leaving England to find her birth mother in America. But all does not go as planned. After Rosie discovers yet more of her family's deeply buried secrets and lies, she is left with an agonizing decision, one with heartbreaking and far-reaching consequences. Readers will be gripped by this thrilling emotional roller-coaster ride as a web of family secrets is ripped apart, profoundly affecting lives on both sides of the Atlantic.