Skullduggery Pleasant mortal coil by Derek Landy

This book is about a girl called Valkrie and a skeleton detective called Skulldugery Pleasant (yes a skeleton detective).While trying to catch a crimanal called Davina Marr they find a bounty hunter called Tesseract trying to kill Davina Marr. Then things got even worse a remnant (aka a thing that posseses people)escaped and realesed the other remnants there are around 1,000 of them.Skulldugery and Valkrie catch them with a giant soul catcher.                                         
  This is a great read that is humorus and action packed at the same time. 

S.H.