I wrote Sherlock (2010 tv drama) fanfiction.
Here is the summary:
A mysterious parcel arrives at 221B Baker Street — inside, a human skull that hums whenever Sherlock speaks to it. What begins as a curious anomaly quickly unravels into a chase through London’s secret societies, haunted auctions, and after-hours museums, where the dead quite literally refuse to stay silent.
As Sherlock and John investigate the legend of Eliza Thorne, the Victorian spiritualist who claimed she could record voices beyond the grave, the case turns personal. The skull seems to respond to them — especially to John — and Sherlock finds himself torn between scientific fascination and something far more fragile.
Between laughter, danger, and the occasional kiss, the two must uncover the truth behind the singing relic before it consumes more than just sound. Because in this mystery, the echoes of the dead aren’t the only ones learning how to love.
You can read the story here on fanfiction archive:
https://archiveofourown.org/works/72727261