Thomas Johnson 
Red and Bloody Forest [EPUB ebook] 

During Victorian-era London, a group of teenagers between fifteen and seventeen embark on an adventure to Hatfield Forest. At first it was all happiness and fun, but as time passed, the days turned dark and sinister. The trip will get dangerous and very scary as they, with the help of famous detective Arthur J. Woolf, investigate the murder of their friend by a masked man dressed in black.