Your one and only is set in the future and is a place that is filled with clones as humans have died of due to what is known as the slow plague. The two main characters are Althea-310 and Jack. Althea is a clone from one of the orginial nine people who set up the community and Jack is unlike everyone else because he is more human then the rest of them. The story shows what the world could be like if scientists ever decided to try and eliminate diseases and try to create a better world, however, new "people" are made in tanks and in each set something is removed so that it is better then the last generation. Jack and Althea-310 are two who realize that things are not as they seem and try to make things better. I don't want to spoil the book but I would recommend reading it if you are interested in how things might go in future years.