House on an Island (Call of Cthulhu RPG)

Introduction
In this adventure, one of the investigators runs into a bit of luck:one of his distant relatives passed away some time ago, leaving him partial ownership of a house on an island off the coast of Maine. On the minus side, the investigator must share the house with another distant relative and his family. On the darker side, the house and island have a terrible secret history, a history that will plunge the investigator
into the depth of horror.
Getting the Investigators Involved
One of the investigators will receive an official letter from the Boston law firm of Goldstein, Hansen, and Wabiski. The letter, which is written in legal jargon, will inform the investigator that the firm is acting on instructions from a distant relative named Vincent Carver, who passed on approximately a year ago, of the investigator.
The letter details that the investigator is to receive ownership of one half of a small island off the coast of Maine as well as one half of the house located on the island (half the house is located on the land the investigator is to inherit). The property is fully paid up and comes with a sum of money allocated solely to pay the property taxes for approximately three years (the amount of time the sum will cover depends on whether the tax rates stay the same or not). The letter also mentions that there are two stipulations in the will. The first is that the property may not be sold without the consent of the owner of the other half of the property. The second is that the investigator must spend a week on the island, doing repairs on the house and maintaining the grounds. After that the title will pass to the investigator.