Man and Wife - Wilkie Collins

This 1870 novel by Wilkie Collins centers around a peculiarity of Scottish law of that time, according to which any man and woman 'who were legally entitled to marry and who asserted that they were married before witnesses, or in writing, were regarded in Scotland as being married in law.' This strange law causes the characters Arnold and Geoffrey both possibly accidentally marrying Anne, though one is engaged to another woman and the other is searching for a more wealthy wife to accomodate his lifestyle. In these circumstances, Anne needs to catch an actual husband in order to save her reputation... - Summary by Carolin and Wikipedia