Rachel Carswell is in her mid-thirties at her fathers funeral when she learns that she was adopted at birth by the couple she has always looked on as her real parents. Much against the wishes of her accountant husband Martin & her adoptive mother Doreen she starts to search for her roots & meets twin sister Cara who turns out to be the woman Rachel could well have been given a different upbringing. While Rachels staid husband & her adoptive mother Doreen are still trying to cope with the sudden intrusion of Cara & her easy-going attractive husband Angus into their lives Rachel & Cara search for their biological mother. & again Rachels formerly serene life is shaken to the core.