The Dark Army by Joseph Delaney
The Dark Army is the second book in the Starblade Chronicles in which Tom Ward is a seventeen-year-old Spook, hunting ghosts, ghouls and all the other other-worldly creatures. Jenny, the first female Spook teamed up with Tom to take on the creatures and other adventures. The second book in the series is an excellent furthering of this storyline and this entire series has great world-building, action-packed events and great characters. I would highly recommend reading this series.