When Mom Left the Universe (Paperback) (ISBN-13: 9781946253095)

Fifteen-year-old genius Eddie Hertz and his twelve-year-old sister Samantha will do anything to bring their missing mother home. When they leap through a homemade multiverse portal, they land in 1871 Chicago on the eve of the Great Fire, where their mom has become a mysterious prophetess warning everyone of disaster.

Racing against time, the siblings must destroy a dangerous "seed of catastrophe," outsmart a sinister steward aboard the RMS Titanic, and master Samantha's glowing skirt of positive energy as well as Eddie's wild inventions. One wrong move and history collapses. Can they save hundreds of lives and finally reunite their family before both worlds are destroyed?