Amulet: Book One The Stonekeeper by Kazu Kibuishi
A young family loses the dad in a horrible accident. Two years later, the mom moves the two children (Em and Navin) into an old family home in the middle of nowhere. The home was owned by great-grandfather Silas Charnon who disappeared mysteriously from that very house. As they clean up and explore, Em discovers the hidden library where she finds the eponymous amulet. Late one night they hear noise in the basement (yeah, the creepy house has a spooky basement). Upon investigating, the mom is sucked into an alternate dimension. The kids, inspired by a voice from the amulet, follow her into the alternate dimension to save her. Naturally they find Silas, an inventor who has several helpful and whimsical robots who help the children on their adventure to save their mom.
The book is a very imaginative take on a standard start. The world inside the basement is interesting and the story moves along at a good pace. I am excited to read more!