[1] The book was first released on April 17, 2008 through Dutton Penguin and follows a young boy that has discovered a city that runs parallel to Manhattan.

[2] The book follows Rory Hennessy, a thirteen-year-old boy that gains the ability to see Mannahatta, a spirit city existing in parallel with Manhattan.

The city is full of legendary persons such as Babe Ruth and Alexander Hamilton, people who have remembered so much that they have been made into immortal gods in the process.

Critical reception for the novel was positive,[3] with Rick Riordan recommending it on his site.

[5] A staff blogger for Scholastic also gave praise for the novel,[6] as did the SF Site.