Chris Harper was her brothers' best friend, so it was only natural that Isobel Matheson would fall in love with him. When he went away to college, she stayed in touch with him in the hopes that one day he would look at her as more than Oliver's little sister. But when Chris returned home after qualifying as a firefighter with a wife, Isobel knew she had missed her chance to tell him the extent of her feelings. She did her best to hide her disappointment, however Charlotte Harper recognised the look in her eyes the minute they were introduced and was instantly intimidated by the woman who knew him so well. Over the years of marriage, her insecurities convince her that she's her husband's second choice and she goes to drastic lengths to prove it.