After being laid off from her teaching position, Mercer Mann is approached by a mysterious woman with a generous offer to go undercover and infiltrate bookstore owner Bruce Cable's life to learn his secrets.

A mysterious manuscript discovered in the tomb of Charlemagne sends Cotton Malone on a perilous international quest that takes him and twin sisters with their own agenda from an ancient German cathedral to the harsh, unforgiving world of Antarctica in pursuit of the truth about the death of his father on a classified sub mission beneath Antarctica.

A miraculous healing serum, kept secret by an ancient puzzle and buried with the mummified remains of Alexander the Great--in a tomb lost to the ages for more than 1,500 years--is the coveted prize for a cunning despot unless Cotton Malone, former U.S. Justice Department agent turned rare-book dealer, can beat her to it.

Bookish high school student Rintaro Natsuki is about to close the secondhand bookstore he has inherited from his beloved bookworm grandfather. However, one day, a talking cat named Tiger appears and asks Rintaro to save books with him. Of course, "ask" is putting it politely -- Tiger is demanding Rintaro's help. The world is full of lonely books, left unread and unloved, and only Tiger and Rintaro can liberate them from their neglectful owners. And...