Thanks everyone!
Since it isn't a good idea to post email addresses here, if anyone would like to join in the fun next time (they seem to be about 6 months apart), send me a private message & I will send you their edress!
This is from their 1st email for this mystery:
"If you have any detective friends who would like to join, have them
send email to ******* and they will be added to our
mailing list. All emails are kept in the strictest confidence as we
are discretion itself."