Rebecca and the Hobgoblin Invasion. The Wingless Fairy, #2

Rebecca used to be a fairy princess. Now she is just a girl with chores, a baby brother, and a white owl who will not stop giving advice. Life as a mortal is not so bad. She has a warm cottage, kind parents, and her best friend Golly, the loyal house goblin who never misses breakfast. Until one morning, he does. When Golly and every goblin in the district vanish without a trace, Rebecca knows something terrible has happened.
The hobgoblins have invaded, and without the goblins to protect the village, mischief is turning to menace. Eggs are stolen. Milk curdles. Fires spread where they should not. Armed with a mysterious golden key and her steadfast owl guard, Rebecca must journey into the dangerous hobgoblin in-between land, a realm of purple skies, flesh-eating plants, and creatures so dangerous that even hobgoblins fear them.
But rescuing the goblins is only the beginning. Laws of fairyland have been broken, secrets reach all the way to the Fairy Court, and Rebecca may be the only one who can set things right.