In October 1844.
George W. M. Reynolds begins publication of the bestselling "penny dreadful" city mysteries series The Mysteries of London.
The original text was published serially in 52 weekly parts. Installments were published weekly and contained a single illustration and eight pages of text printed in double columns.
https://en.wikipedia.org/wiki/The_Mysteries_of_London
The Mysteries of London at PG:
https://www.gutenberg.org/ebooks/author/32536