In any normal situation Fiona and Sarah would be friends. They are both smart and loving, great mothers, brilliant at life. But when Sarah arrives in Fiona's small seaside town, it's not a normal situation. Sarah is on a mission and before either she or Fiona know it - and without her meaning to cause havoc - that single-minded vision has turned both their worlds upside-down. Fiona and Sarah both discover that just as love drains out of lives that are routine and taken for granted, so it can also flow back into those lives in unexpected and breathtaking ways. And where the love gets in, it changes things forever ...