In Core already are The Sign of the Four and A Study in Scarlet by the same creative team and publisher.
Publisher: Self Made Hero.
The Hound of the Baskervilles.
Barcode: 9781906838003
Writer: Ian Edginton.
Artist: I.N.J. Culbard.
Release date: 2009.
The Valley of Fear.
Barcode: 9781906838058.
Writer: Ian Edginton.
Artist: I.N.J. Culbard.
Release date: 2011.
If you wanted to form them into a series:
Hound (2009)
Study (2010)
Sign (2010)
Valley (2010).
They’ve recently all been re-released in new editions with new covers and ‘Sherlock Holmes’ added to the masthead.