Tara is from Derry, Faith is from Armagh; their lives are very different, but they look exactly the same - they just don't know why. Two teens from very different backgrounds - Tara, the Catholic daughter of a two generation single parent family, and Faith, the daughter of strict Evangelical Protestants from Armagh, come face to face at a residential and discover they look almost identical. A DNA test reveals they are related, and that Faith's father is not who she thinks - while Tara has never known hers. Between them, they set out to unravel the mystery of their shared parentage, but in doing so set in motion a series of revelations about the pasts of both their families. Meanwhile, they are also dealing separately with their own issues - Tara angry and grieving after the sudden death of her boyfriend Oran, and Faith hiding her true sexuality from her family for fear of being disowned.