author vampirates: black heart
Vampirates is a series of books by British author ___MASK26___ , about a set of twin children , Connor and Grace Tempest , who get separated at sea and are picked up by two very different ships . The term " Vampirate " refers to a vampire living on the pirate ship , the Nocturne . Later changed to " Nocturnal " to differentiate themselves from rebellious and uncontrolled Vampirates . Black Heart is the fourth novel in the Vampirates series . Following on from the lives of Grace and Connor Tempest . ___MASK26___ is the British author of the " Vampirates " and the " Allies & Assassins " children ' s novel series . A sea is a large body of salt water that is surrounded in whole or in part by land . More broadly , " the sea " is the interconnected system of Earth ' s salty , oceanic waters  considered as ___MASK56___ global ocean or as several principal oceanic divisions . The sea moderates Earth ' s climate and has important roles in the water cycle , carbon cycle , and nitrogen cycle . Although the sea has been traveled and explored since prehistory , the modern scientific study of the sea  oceanography  dates broadly to the British " Challenger " expedition of the 1870s . The sea is conventionally divided into up to five large oceanic sections  including the International Hydrographic Organization ' s four named oceans ( the Atlantic , Pacific , Indian , and Arctic ) and the Southern Ocean ; smaller , second - order sections , such as the Mediterranean , are known as " seas ". Twins are two offspring produced by the same pregnancy . Twins can be either " monozygotic " (" identical "), meaning that they develop from ___MASK56___ zygote , which splits and forms two embryos , or " dizygotic " (" fraternal "), meaning that they develop from two different eggs . In fraternal twins , each twin is fertilized by its own sperm cell .