He should consult an archaeologist. They study ancient studies looking for remains of buildings, objects, people, etc. They learn a lot about our past and what our ancestors were like through archaeology.
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The woman in white is wilkie collin's fifth published novel,written in 1859.it considered to be among the first mystery novels and is widely regarded as one of the first (and finest) in the genre of "sensation novels".
The Church was extremely influential during the medieval ages. They held the ability to disperse information because churches were scattered all over Europe. This enabled their network of monks and priests to share information very fast. Furthermore, they collected taxes from peasants very often in the form of goods (farm produce for example), this made them very rich. They also had control over decisions which different rulers did as they could exile them which wasn't something any ruler wanted.