Dan (Compston) and Emily (Rundle) have everything. They live in a beautiful house in the best part of Glasgow. They’re crazy about each other. Only one thing is missing – they’ve been trying for a baby for years without success. A chance encounter brings 18 year old Kaya (Mack) crashing into their lives. It seems that fate has brought them together when Kaya makes them an offer they can’t refuse. She can change their lives if they agree to change hers. With only one embryo left can Dan and Emily trust a teenager with their last chance to have a family?