She’s not the nanny he advertised for…Jon Blackwell needs a woman ready to tackle the duties of a cattle ranch and two lively, take-no-prisoners twin girls. But ever since Lydia Newbury showed up at his six-generation Montana spread, the frazzled single father is rethinking, well, everything.The Philadelphia dazzler is a marvel. What he doesn’t know is the secret that has Lydia on the run…