Prologue: Welcome to Concordia!

Note: I recommend you to play or watch Criminal Case: Mysteries of the Past before you read this fanfiction. Also, this is the first book of the three about my MotP fanfic. The other two will publish after per series. One last thing: English is my second language, so I'm not really good at grammars.
Summary: This takes place in Concordia Late 19th Century, where my OCs, who were the Time Agents came to investigate what was the mysteries behind the city. This the first book of the series and also my first book.