This is the Tomb Of Hannah Courtoy in Brompton Cemetery, London.

Hannah Courtnoy was a wealthy woman who died in 1849. In life she was friends with an Egyptologist, Joseph Bonomi, who claimed to have rediscovered the secret of time-travel from ancient Egyptian records.

Her tomb is reputed to contain a working time-machine, built by Bonomi. Why doesn’t someone just go inside and see whether it does or not? Unfortunately the key to the tomb has been lost, and the tomb has not been opened for over 100 years.

Perhaps the key has been taken back through time for safekeeping?

Spookie the Cat wants to visit this tomb, and perhaps she’s the one to get inside?