The Ghost - 1.

The Problem hasn't been around for very long, but there's no denying it exists. Visitors haunt the London streets, able to kill with a single touch. Only children can see ghosts and it's the children that have to fight off the Visitors with shining rapiers and magnesium flares. When Lockwood and Co. get propositioned with a dangerous job in an old country mansion things get dangerous and the tension rises as they struggle to find the hidden Source and untangle the mystery of the Shimmering Wraith.