Books 1-3 in the Last Timekeepers series by Sharon Ledwith, now available in one volume!

The Last Timekeepers and the Arch of Atlantis: After 13-year-old Amanda Sault and her classmates uncover a mysterious stone arch, they learn that it's an ancient portal created by the lost civilization of Atlantis. Chosen by an Atlantean Magus, Amanda and her companions are swept into the secret world of the Timekeepers: legendary guardians entrusted with preserving history from a sinister force known as Belial.

The Last Timekeepers and the Dark Secret: In Nazi-occupied Amsterdam during World War 2, the Last Timekeepers are tasked with locating an ancient book before it falls into enemy hands. With help from the Dutch Resistance and a mysterious baron, they must stay one step ahead of a regime determined to silence the truth.

The Last Timekeepers and the Noble Slave: On his third Timekeeper mission, eleven-year-old Drake Bailey must confront a dark chapter of history: the antebellum South. In a time of fear and cruelty, Drake must outwit his captors, protect a vital bloodline, and find the courage to break the chains that threaten to destroy him. Do the Timekeepers have what it takes to complete their mission and protect the timeline?