The Strange Case of Finley Jayne is a prequel novella for the Steampunk Chronicles series by Kady Cross. I actually picked up this story after I'd read the first book (The Girl in the Steel Corset) but I think it makes a great introduction to the series and I would definitely recommend giving it a try.
Finley Jayne is a great main character, she knows that there is something different about her but she uses her strength to protect others. In fact we are introduced to her as she is fired from her job for protecting a small boy. She is offered a new job as a companion to a young lady called Phoebe but her suspicions are raised because the job seems too good to be true. Phoebe has recently become engaged but Finley is suspicious of the motives of her much older fiance so she takes it upon herself to investigate. What she uncovers is worse than she could ever have suspected.
I really enjoyed The Girl in the Steel Corset and I think I liked The Strange Case of Finley Jayne even more. If you haven't already started this series then it's one I would definitely recommend checking out. I love the steampunk world that the author has created (although you don't find out as much about that in this novella as you do in the first book). I'm impressed with how much Kady Cross manages to pack into this story and am really looking forward to reading the next book (The Girl in the Clockwork Collar) when it is released next year.