Bella and Edward are to marry. Jacob becomes upset when he learns that Bella is planning to consummate the marriage on her honeymoon. The wedding over, Bella and Edward spend their honeymoon on the Cullen's idyllic private island. But, to their dismay, they discover that Bella is pregnant. The fetus is growing at an accelerated rate and everyone fears for Bella's safety. Will she go ahead with her pregnancy, whatever the cost? The Quileutes close in as the unborn child poses a threat to the Wolf Pack and the towns people of Forks.
Monsters generate their city's power by scaring children, but they are terribly afraid themselves of being contaminated by children, so when one enters Monstropolis, top scarer Sulley finds his world disrupted.