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Heidi's 13th birthday is coming up
Heidi's 13th birthday is coming up and she has just found out her mother is pregnant -
Heidi's mother is pregnant
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Period: to
timespan
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Heidi's annual trip to the farm is canceled
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Heidi's dad is a border crosser
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Heidi's dad needs to find a job in the east
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Heidi's parent tell her they are fleeing west
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Heidi must get her grandma and go west
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The border closes
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Heidi loses her grandma
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Heidi must find her own way across