The Whispering Skull is a young adult thriller novel by Jonathan Stroud.

The Whispering Skull was mentioned in an article of The Daily Telegraph twice in March 2015.

[4][5] After months of not having any cases to solve, Lockwood makes a bet with their rivals, the Fittes agency, and whoever loses has to admit their defeat in the newspaper.

All goes well until George trips and falls into the coffin releasing a horrible phantom, as well as a powerful Source which kills whoever looks into it.

Lockwood and Co. are tasked to retrieve the Source at all cost before it starts wreaking havoc in London.