The Witching Hour — Martina Dalton

Haunted castles. Tortured souls. An evil beyond imagination. Jenny Crumb and her friends are looking forward to a fun time backpacking across Europe. Instead, they encounter the ghost of a little girl who desperately needs their help. An evil spirit has trapped the tortured souls of women who've been persecuted as witches throughout history. The spirit is now after the ghost girl. But when the teens make an effort to help her, the evil spirit turns on them, chasing them through haunted castles from country to country. As the dark entity grows angrier with every encounter, Jenny must call on a powerful being of light to help them. Will it be enough to release the trapped souls? Will Jenny and her friends survive?