Sherlock Junior i bezg?owy goniec

"This time Sherlock Junior and his friend Walter, aka Watson, will be among the suspects themselves. During a visit to the British Museum the boys discover a priceless chess piece--bishop--has its head off. When the guards of the museum, alerted by the young detective, arrive, the figure of the messenger is lost in the general confusion! Will the deduction skill fail Sherlock and Watson again this time?"--Google translate.