William Harrison Ainsworth 
Auriol [EPUB ebook] 

Auriol Darcy is surprised attempting to remove the heads of two traitors from the Southwark Gateway of Old London Bridge. He is injured by the warder, Baldred, and carried to the house of Dr Lamb, an alchemist and Auriol Darcy’s grandfather, who is assisted by his faithful dwarf Flapdragon. Lamb, on the point of discovering the elixir of life, has a seizure and dies as his ungrateful grandson consumes the draught. (Excerpt from Wikipedia)