When Sol and Connie Blink move to Schoneberg, one of the first people to welcome them is an odd older woman, Fay Holaderry, and her friendly dog, Swift, who carries a very strange bone in his mouth. Sol knows a lot more than the average eleven-year-old, so when he identifies the bone as a child's femur, he and Connie begin to wonder if their new neighbor is up to no good.

In a spine-tingling adventure that makes them think twice about who they can trust, Sol and Connie discover that solving mysteries can be a dangerous game - even for skilled junior sleuths.