Dubliner Tara McGoldrick wants love to make friends with a woman that who saves on that day. But she has no way to find her. Then she saves the woman's life, slightly injuring herself in the process. Talking together later in hospital, Tara gets her wish for friendship when the woman invites to have dinner. But even more of the conversation, they learn that woman saved Tara. Tara life through a blood donation. And, so even more than friends , they're blood sister's.