Sherlock Sam and the Cloaked Classmate in MacRitchie

 is the 6th book in the Sherlock Sam series.

Synopsis
Sherlock Sam encounters his most important mystery yet! His classmate has gone missing at MacRitchie Reservoir and no one can find him. Fearing the worst, Officer Siva refuses to let the Supper Club help, but there’s never been a mystery Sherlock, Watson and their friends could ignore! Part One of the Fiendish Mastermind Trilogy!