Vampire Plagues #1: London by Sebastian Rook (author)

The ship reached the dockside just as the sun finally vanished. Suddenly a great black cloud seemed to billow up from the deck. It swooped straight at Jack and he fell backwards with a yell. Black creatures, large as crows, swarmed only feet overhead. They were bats, hundreds of them, the largest he had ever seen…

The bats aren’t the only things to leave the ship that foggy night in London, 1850. A small, frightened figure scurries down the gangplank and staggers onto the docks. Ben has been on board for the whole voyage, and what he has seen will haunt him for the rest of his life. But as London falls into the terrifying grip of the vampire plagues, only Jack and Ben can prevent the city’s total destruction…