Collects five long stories: a blend of the supernatural, macabre and mystery, stories in which Sherlock Holmes is assisted by the likes of Arthur Machen and M.R.James. Hardcover (there was a simultaneous paperback edition).

''five cases involving forces that are not of this world. Missing manuscripts, strange sects, sudden deaths and mysterious encounters all lead Holmes and Watson into a twilight world of mystery, magic and danger''.