A nice set of 4 paperback Dracula series novels by Fred Saberhagen.

Included:

Dr Emile Corday, aka Dracula, is summoned to the aid of the Sutherland family, descendants of his great love, Mina Harker. Corday finds himself facing a rebellious faction of American vampires out to see him and anyone he cares for annihilated. Leading his adversaries is the evil and alluring enchantress Morgan Le Fay.
The immortal Count Dracula—Vlad Tepes, Prince of Wallachia—hunts the murderous art thieves who have stolen the portrait of his lost love. But the thieves are after more than art. From the Master Vampire they would steal the very secrets of life—and death!
Chicago Police Detective Joe Keogh, husband of Mina Harker's great-grand-daughter, turns to Count Dracula for help when his investigation into a series of bizarre murders turns out to involve vampires, sorcerers, and the deadly fight to gain control of a magical sword.
In 1792, Philip Radcliffe, the bastard son of Benjamin Franklin, comes to France to deliver a letter to Thomas Paine--only to get caught up in a conflict far more horrifying than the Revolution. By foiling a powerful vampire's attempt at fratricide, Radcliffe dooms himself and his descendants to suffer the vampire's eternal vengeance.

In present day, Philip and June Radcliffe are kidnapped on their honeymoon. Their captor, a mysterious Mr. Graves, swears that he aims to protect them. Yet as the thrilling story unfolds, involving Napoleon, the Marquis de Sade, and the Scarlet Pimpernel, as well as Jerry Cruncher and Detective Dupin, the young couple refuses to believe him--a mistake that is certain to cost them their lives.

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