Dark Fire by Chris D'Lacey

David Rain was lost in the Arctic and it was up to his daughter, Alexa, to bring him back. This one little girl had the power to save her father, but when she found him, she uncovered a lot more than just David: Dragons have finally returned to Earth as well. . . .
With the Earth on the brink of recolonisation by dragons, David is sent on an important mission: to seek out and destroy a trace of dark fire, the deadliest force in the universe. But with success could come a terrible price, the sacrifice of a beloved clay dragon. How much does the life of one small dragon count, when the alternative is the birth of a darkling...?

Chris d'Lacey weaves another fiery and magical tale for readers in the fifth book of this NEW YORK TIMES bestselling series!