Book 8. The Ghost of Dracula in the Russian Manor. - The Criminal Investigations of the Imperial Gendarme, #8

The health of the old Count Shakhovsky is deteriorating. Mysterious events continue to take place in the estate. The old Count thinks that his days are numbered and a will must be written. The old Count dies under mysterious circumstances. The nurse of the old count is convinced that he was killed by the ghost of Dracula. Soon after, under mysterious circumstances, Gregory Shakhovsky, the heir and son of the old count, died in Moscow.
The entire financial condition, the Yaroslavl estate, serfs and the Moscow house were inherited by Natalya, the wife of Gregory. Lieutenant Polyansky is investigating the mysterious death of the young Count Gregory Shakhovsky. And he learns about the family tradition associated with the ghost of Dracula. However, the lieutenant does not believe in otherworldly forces. And he suspects that the young count was poisoned by his cousin Anatole Dubovitsky.
After all, Anatole has long been in love with Natalya.