Escape from the Children's Horrible House — N. Jane Quackenbush

In this third book of The Children's Horrible House series, Holly Spinatsch and Coriander Oats have returned only to realize they must escape immediately. Memories of her Horrible House friends and Coriander's obsession to find the hidden treasure have led them back to discover that the intimidating house is more fragile than it had appeared. Holly learns that the mystery she uncovered on her first visit was just the tip of the iceberg. With the help of Juniper and her friends, Holly discovers a hidden presence much larger than anyone could have imagined. From deep inside an underground cave, a signal is calling while a cosmic force threatens to engulf the entire estate. Will Holly and Coriander escape empty-handed, once again? Will they escape, at all?