When Silas Bird wakes in the dead of night, he watches powerlessly as three strangers take his father away. Silas is left shaken scared and alone - except for the presence of his companion, Mittenwool ... who happens to be a ghost.
But when a pony shows up at his door, Silas knows what he has to do. So begins a perilous journey to find his father - a journey that will connect him with his past, his future and the unknowable word around him.