Harry Markos 
The Lost Ones [EPUB ebook] 

Brandon and Emily were not going to a nice sunny place for their summer holiday this year. They were spending it with their mother at the old dusty railway station where she worked – and the children were not looking forward to spending a very boring summer there. Little did they know that the railway station had a secret that would take them on adventures that they could only dream of – or have nightmares about!