SOLVED: To Sandoulous to Weds..alexandra benedict

Book is girl grows up in love with brothers friend who spends lots of time through the years with family, especially Christmas Holidays.  He belongs to a sex club where aristocrats dress as priests and prostitutes are nuns.  She follows him and catches him with "nun".  After that she wants nothing to do with him....Think they had to get married..There is a "villain" who wants to marry her.  End of book shooting and hero survives (takes place outside in the snow
).