Haddix, Margaret Peterson.

In over their heads / Margaret Peterson Haddix. - First edition. - 307 pages ; 22 cm. - Under their skin ; book 2 .

Sequel to: Under their skin.

Twelve-year-old twins Nick and Eryn and their robot stepsiblings, Jackson and Ava, try to save humanity from killer robots.

ISBN: 9781481417617 (hardcover)

Subjects--Topical Terms:
Robots
Human beings
Extinction (Biology)
Secrecy
Twins
Brothers and sisters