Vanishing Breed Series by Margaret L. Carter

A successful, middle-aged psychiatrist tormented by an unquenchable lust for blood... A vampire serial killer on the rampage... At the age of forty, Dr. Roger Darvell discovers that he is no ordinary man. He also discovers that vampires exist, and that a few of them kill as wantonly and cruelly as any monster in a horror film... moreA successful, middle-aged psychiatrist tormented by an unquenchable lust for blood... A vampire serial killer on the rampage... At the age of forty, Dr. Roger Darvell discovers that he is no ordinary man. He also discovers that vampires exist, and that a few of them kill as wantonly and cruelly as any monster in a horror film. When a renegade vampire follows Roger from Boston to his new home in Maryland and attacks one of his patients, Roger must come to terms with the newly discovered truth about his heritage. And he must find a way to destroy the killer before his newfound lover becomes the renegade's next victim. less

Science fiction conventions attract some strange people, but Sherri Hudson never expected to spend a con weekend helping a sexy man in a cape steal photos of a winged alien. When the photographer is murdered, and Nigel Jamison reveals to Sherri that the "alien" is actually his sister, the situation gets intriguingly complicated. Unwillingly swept up in Nigel's quest to rescue his sister, Sherri can't help being fascinated with him... moreScience fiction conventions attract some strange people, but Sherri Hudson never expected to spend a con weekend helping a sexy man in a cape steal photos of a winged alien. When the photographer is murdered, and Nigel Jamison reveals to Sherri that the "alien" is actually his sister, the situation gets intriguingly complicated. Unwillingly swept up in Nigel's quest to rescue his sister, Sherri can't help being fascinated with him. By the time she finds out he's a vampire, the fascination has become mutual... And too strong to resist. less

CRAVING HER, HE COULD HANDLECaring about her beyond a basic need to keep her safe, he could not. Maxwell Tremayne never should have touched her, kissed her, tasted her. It was foolish--dangerous--for a vampire to get involved with a human, let alone a flesh-and-blood spitfire of a woman with curves like Linnet's. Maxwell had to remember that it was tragedy that had brought them together on this dangerous quest to catch a cold-blooded killer... moreCRAVING HER, HE COULD HANDLECaring about her beyond a basic need to keep her safe, he could not. Maxwell Tremayne never should have touched her, kissed her, tasted her. It was foolish--dangerous--for a vampire to get involved with a human, let alone a flesh-and-blood spitfire of a woman with curves like Linnet's. Maxwell had to remember that it was tragedy that had brought them together on this dangerous quest to catch a cold-blooded killer. Even if they survived this struggle unscathed, imagining that they could share anything more than a fleeting affair was as ridiculous as...imagining that he could live another hundred years without her. less