Suddenly at His Residence

Grandfather is found dead in the little Grecian lodge among the rose gardens of his estate - and Inspector Cockrill has reason to believe that Sir Richard met with an untimely death. The night he died, cantankerous Sir Richard was arranging to disinherit his offspring for the umpteenth time. And someone took murderous steps to protect their own interests. So how was it that the murderer left no scuff in the raked sand paths, no trace on the manicured lawns?