This is the first part of a paranormal YA trilogy, set in New York during the 1920s (the ending, actually, I think the crash will take place during the next book). The main character is Evie O'Neill, a 17 year old flapper with magic powers, and 6 other youngsters (and her uncle) -- so it's almost like an ensemble cast (can I use this expression for books?) and every reader is bound to fall in love with at least one of the characters (I love them all, although maybe Memphis best). It sounds cheesy but IT'S NOT. 
 There is a main plot and "villain" that is resolved by the end of the book, but there are also a lot of seeds planted for the bigger arc of the trilogy. This is quite the introduction, actually, many of the characters don't meet in the entire book, and there are more questions brought up than answers. So, yeah, I dare you to start it and -- not not finish it, but to not finish the entire trilogy! 
 As I said, I know it may sound silly: a paranormal YA about ghosts and magic... But trust me, it's very scary. VERY.