A Matter of Conscience — Rosemarie E. Bishop

After more than 500 years, Christian Desmonde is finally going to be reunited with Diana, his sister whom he never knew had joined the immortal world of the vampire.  But Diana, who had also been deceived into believing her brother was killed in a bar brawl, discovers the truth by accident when Samuel, her companion, leads her right into his path.  Immediately, Diana sees the lie for what it was.  In an angry tantrum she disappears and runs to Niagar Falls where she believes no one will think to look for her.  But she is discovered by the oldest, most vicious vampire in existence . . . . . . .Gaetano Minotti, who is also the head of the MAFIA.  Only Jesse, an angel and friend of the vampires, has a chance to save her.  But, what will Minotti do once Diana is found missing?  A Matter Of Conscience is a tantalizing novel that deals with the poer of love and the destructive potential of even the simplest lie.  Human nature causes us to lie to avoid conflict, but we never see how devastating a lie will become if left unsettled in truth.