When it comes to relationships, A&E consultant Josh Sullivan is very happily single . and despite the attempts of the beautiful women he intends to stay that way. Single mum. Dr Kat O'Brien would usually be completely off-limits to him, except he can't get the stunning doctor out of his mind. And he's touched by her devotion to her six-year-old son, Archie, who he discovers is a pretty great kid. Before he knows it, Josh is hooked . but will Kat ever believe he can offer them a future?