Best friends Lizzy and Luke are almost like family. When they were kids, they had to go through their parents' divorce together. Shared experiences brought them closer, and since then they've been almost inseparable. Now, as adults and single people, they want to start their own family. However, not in a conventional way. Lizzy is a lesbian, and Luke is heterosexual, but nevertheless they decide to have a child together. One day Luke meets a cheerful girl from Britain named Prudence. They instantly fall in love with each other, and it is at the moment Lizzy realizes she is pregnant that Luke announces his intention to marry Prudence.