This was done as a commission for Michael that turned into an alternate cover for his Sherbet Lock book which you can fund at Kickstarter.

Here is a description of Sherbet Lock from the Kickstarter page:

For those of you not in the know, SHERBET LOCK (everybody’s favourite drug-addicted, lesbian paranormal detective from the future) is the brainchild of writer Michael Vincent Bramley and artist Joshua Mathus. They have been self-publishing Sherbet comics for years and are now asking for your help in bringing their warped, demented spin on Sherlock Holmes to a wider audience.