I once read this fanfic where Martin and Diana had to go undercover as a newlywed couple on their honeymoon. They had to change their style to macth their identeties as MR. and Mrs. Renault. A "couple that married as soon as they turned 18".
This is a link to the story, but sadly it is not finished. [link]
WHICH VERSION DO YOU LIKE THE BEST? THIS VERSION OR THE FIRST?
Marathon owns all characters from the serie "Martin Mystery".