Explore the mysterious case of Spring-Heeled Jack - was he real or an urban legend? Author John Matthews provides an extensive look at SHJ from his ancient beginnings, to connections to Jack the Ripper & Slenderman, explored in his book "The Mystery of Spring-Heeled Jack."Described as-a tall, thin, bounding figure with bat-like wings, clawed hands, wheels of fire for eyes --Spring-Heeled Jack first leapt to public attention in Victorian London.