Cover of Bone Quill
||John and Carole Barrowman
||The Book of Beasts
Bone Quill is the sequel to Hollow Earth from sibling writing pair John Barrowman and Carole Barrowman, published in February 2013.
In this book the two young adventurers try to find the bone quill to help them in their quest along with the book of beasts to a) find their father and b) save everything.