The Inkwell Chronicles

When their father goes missing after a mysterious train crash, Everett and his little sister Bea find a curious pen in his belongings, and its magical Ink begins to rewrite their once-ordinary lives. The Ink leads them to a world they never knew existed—one teeming with impossible magic, formidable allies, and villains who are determined to destroy everything they hold dear. Together, Everett and Bea embark on an adventure through secret tunnels in England and Scotland to find and protect the last Inkwell, and ultimately to save their father.

In book two of The Inkwell Chronicles, Everett and his little sister Bea find themselves drawn even more deeply into the secret world of the Inklings, those who seek to protect the world's rapidly diminishing supply of magic Ink. When a miraculous new type of ink called Inkanto begins to appear around the world, initial celebration soon gives way to suspicions about its mysterious origins. As the race to find and control the world's supply of Ink intensifies, signs begin to appear that not is all that it seems.