David and Bernice start The Walk Right In Detective Agency where they plan to solve the simple everyday mysteries which the police don't have time for: problems such as finding out why Bradley's girlfriend has been avoiding him, where Mrs Posonivic's cat disappeared to, and why newspapers are disappearing from front lawns. But when Bernice and David's close friend Catherine discovers she is adopted, Bernice and David are given the trickiest case of all...(Publisher's blurb)