Gerta is determined, brave, and a round character as she is the narrator and you read only her thoughts. She is also dynamic as in the beginning of the book she simply does what she is told without question, but by the end of the book she is determined to do what she thinks is right.
"'You suggested it,... I saw you' 'I only wanted you to know we were coming'"(255)
Everyone around Gerta, the Nazi soldiers, the neighbors, everyone telling her she can't do it. None of the antagonistic characters are round or dynamic.
"'He was right here, Fritz! Another second- one more step-'" (181)
Nothing is impossible when you put your mind to it. Gerta decided to cross the Berlin wall even though everyone around her told her she couldn't and shouldn't.
"Our family was like a house of cards in a stiff wind" (36)
Foreshadowing: When Gerta's father dances across the wall to her, the reader thinks that he is telling her to dig. At the end of the book, it is revealed that he was trying to tell her that he was digging and wanted her to be ready.
Suspense: When Müller is searching the building from the outside, he shines his flashlight through a boarded up window and almost discovers their digging, which would have resulted in their arrest and possibly deaths. But fortunately, they had recently emptied out dirt from the building.
Figurative Language-simile: Their family isn't expressive, is tense, and fragile, but obviously not actually a house of cards.