Episode 1: The Arrival. A new system joins the office. Everyone is on their best behaviour. Data is being logged correctly and completely. There is genuine enthusiasm. Nobody has yet discovered the import errors. Episode 3: The Plot Twist. A spreadsheet is discovered that was never imported into the system. It contains two years of tenancy data. It was built by someone called Gary. Gary left in March. The spreadsheet is labelled "DO NOT DELETE" and nobody will open it. Episod