When the code team learns that Lizzie has an aptitude for puzzles, Ripred makes the suggestion that she replace Boots. Shortly after this incident, an upset Gregor is called to the code room for an 'emergency with sister', and discovers eight-year-old Lizzie has come to bring him home. Solovet still wants Gregor imprisoned, until Ripred and Mareth inform her that Gregor has recently developed romantic feelings for Queen Luxa, and would never leave Regalia while she is hospitalized.

He is eventually released by Nerissa to help his sister Boots while the toddler works to fulfill the Prophecy of Time by deciphering the rats' ' Code of Claw'. Gregor rushes his ill friends back to the city for treatment, whereupon Solovet orders him locked in the dungeon for insubordination. He and his bond Ares disobey Solovet and return to the Firelands to find the terribly ill Luxa, Aurora, and Howard. As the novel opens, Gregor is numb with shock from the Prophecy of Time's apparent prediction of his death. Only a few hours have passed since the closing of Gregor and the Marks of Secret, when Gregor returns from the Firelands to warn Regalia of an impending gnawer attack. In its description of the novel, as part of its 'Recommended Books' award, the CCBC states, 'Although Gregor and the Code of Claw works as a stand-alone story, readers will want to start with book one and work their way through to this final volume.' An audiobook version was released in 2008, read by Paul Boehmer. The novel has been praised especially as a conclusion to The Underland Chronicles. Scholastic has rated the book's ' grade level equivalent' as 4.5 and the book's lexile score as 730L, making it reading-level-appropriate for the average fourth to sixth grader. It is the fifth and final book of The Underland Chronicles, and was published in 2007. Gregor and the Code of Claw is a children's novel by author Suzanne Collins, best known for her Hunger Games trilogy.

The bane chronicles books