Vocabulary

unison - The act or an instance of speaking the same words simultaneously by two or more speakers.

page  13 "Who?" asked Simon and Mallory in unison.

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skulk - to move in a sly manner; slink; creep; lurk; prowl; lie in wait

page 34 - Sometimes I saw shapes skulking around in the dark.

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cooped up - to place in or feel like being placed in an enclosure, cage, or pen; confined

page 65 - She blamed their constant squabbling on being cooped up inside but, with a single stern look at Jared, made all three promise to be back before dark

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pact -   A formal agreement; promise; bargain; agreement; treaty; contract; settlement; deal

page 90 - He has been gathering goblins to him and making pacts with dwarves.