A bizarre murder leads Daniel to a century's old secret. The descendants of a Viking horde are hiding from an ancient curse. Can Daniel save his mentor and unravel the mystery before his friends are destroyed?Deep under the streets of London, a hidden race of bird-like creatures have been patiently waiting for the return of their master. Old enemies have allied with the creatures, and together they are bringing about a chain of events which could destroy the city. Sleep Demon is the third instalment of the Whistler Series, written by Amazon bestselling author, T.J.Garrett. Sleep Demon broadens the Whistler story by introducing new friends and enemies and pitting Daniel against ever more peculiar adventures - but the story does not end there: Watch this space for more Whistler books in Winter 2017 and beyond.