If you want to find your mother.....follow the river upwards
Emily's dad dies in a car accident. Emily's mom can't afford living in a city so they move to her great grandfather, Silas Charnon's house in the woods. Emily decides to explore the house where she finds a stone hidden in Silas' library.
Emily's stone tells her to keep safe her family. Later that night, her mom hears sounds so she sees what it is. Emily's mom goes to the basement, but she doesn't come back, because a strange creature captures her mom and takes her to a door that leads to a different world.
The stone tells Emily to follow the river upstream where she'll find a house and she must aid the man who lives at the house if she wanted to save her mom. But they have to be careful for the creatures that she might find
Emily and his brother find the house where Silas dies. In the house they find many robots that help them find their mom. They would use a special map that tells them where every creature is, and a airplane to get to the creature that captured her mom
Emily got her mom back from the tentacled creature, but sadly the creature stung her mom, so she wasn't able to move. Later that day, Emily fought with the elf that rescued her mom aftewards so she could get her mom back.
They took her mom back to the house to see if they had anti venom, but they didn't, so they had to go to the nearest city to find an antidote for her mom.