Haddo, Haddo, Haddo, what's all this then at murder mystery weekend Take a historic mansion, add a gruesome murder, inject a soupcon of modern scientific crime solving...and you have the requisite ingredients for CSI: Haddo. The totemic 18th-century building will be at the centre of a compelling murder mystery this weekend when the inaugural Unsolved Festival arrives in the north-east. This unique event will offer the public the opportunity to play detective and help sift through a variety of clues, as well as getting involved in crime-writing workshops and mystery tours. "People who come along are the detective, they have to use their own skills of observation and detection to determine whether a crime has been committed and, if so, who the perpetrator was," said Fiona Watson, the development manager of ABSAFE. They then get to test these theories by carrying out forensic experiments, using modern-day techniques, and comparing them with those from the 19th century. The storyline has been penned specially for the festival and, with clues liberally located throughout the building, the amateur sleuths will have to employ all their little grey cells. "The house is such an amazing setting and there are so many rooms," said CSI writer, Bill Kirton. I mean, you could commit umpteen crimes and get away with them, because there are so many places to go and it's made for things like this, mysteries and so on. The Unsolved Festival runs all weekend. So, as to what's on, the game's afoot!