I have read quite a few books by Isabel Allende but was intrigued by the blurb of "Ripper" which sounded very unlike any of her other books.
Amanda, a teenager living in San Francisco initiates an online roleplay called Ripper where she and a handful of youngsters from all-over-the-world (and secretly her grandfather) investigate the latest of the citys murders. With her father being a policeman she is naturally interested in crimes and even gets her Dad to listen to their theories. The group finds out that the murders are related and when her mother vanishes they better hurry finding the culprit!
I had an inkling early on who could have done it but had no idea why or how and it didn't lessen my enjoyment one bit! If you like young adult fiction don't miss Allendes trilogy starting with "City of the beasts".