London finest Margo Chicora London and herbrother Henry Oliver London finds out that being brother and sister is more than meets the eyes and that their family have more secrets more deceit more lies Then even the two of them can keep up with and to top it off they just found out about each other their grandfather before dying told Margo all about Henry the family secret well join them as they uncover world of mystery as London's finest. If they don't get themselves killed first. But they are the two best detectives in London.