Dr. Watson is talking to Sherlock Holmes at 221B Baker Street, London. Watson asked Sherlock to clean up his mess. Mscrave went to Sherlock Holmes for help about business at the Hurlstone.
Rachel developed brain fever and was engaged to Brunton, but he dumped her so now she is very sad. Brunton was caught going through family documents wchich resulted in him being fired. Brunton was given a week to go, and on the third day he disappeared. Rachel became sick again so a nurse was sent to watch over her, bu when the nurse fell asleep on the couch, Rachel climbed out the window.
Sherlock holmes wanted to look at the Musgrave Ritual, they go to the Hurlstone to try to figure out how to solve the rituals riddle. Sherlock calculated the math to find the entrance to the cellar.
They found the spot and a chest with Brunton's body on top of it under one of the floorboards in the cellar.
They find out how Brunton dies and that Rachel either killed him or it was an accident.
The treasure was the crown of Charles || Rachel was never heard of again.