A standalone, adventure-packed companion to the New York Times -bestselling middle grade graphic novel Compass South, from the same team who created the Eisner Award-winner Salt Magic.

Twelve-year-old twin adventurers Cleopatra and Alexandra Dodge are reunited with their father and realize that two family heirlooms reveal the location of a treasure that is their birthright. When they set sail with Captain Tarboro on the Almira, they know they're heading into danger - the ocean is filled with new and old enemies, including their nemesis, the infamous pirate Felix Worley.

But like a coral reef that lurks below the surface of the waves, trouble is brewing between the siblings. Alex is determined to become a sailor and is happy with his role aboard the Almira, but Cleo - the only girl on the ship - is tired of washing dishes in the galley. In an effort to find her own purpose, she begins studying sword fighting with Tarboro, but neither Alex nor her father approves. Can the twins remain close as they pursue different goals and dreams, or will their growing differences tear the family apart before the treasure can be found?

Hope Larson and Rebecca Mock once again create an outstanding seafaring adventure with Knife's Edge .

Richly colored illustrations breathe life into the rough seas and tropical locales. . . . As in its predecessor, every question answered leads the twins to more questions to be asked, and it ends with a breath-catching cliffhanger. An action-packed sophomore volume, with no loss of wind in its sails." - Kirkus Reviews