The Inkwell Chronicles - The Ink of Elspet

Eleven-year-old Everett wishes he were as brave as the characters in the comic books his dad draws. But when his father goes missing after a mysterious train crash in London, Everett and his little sister Bea are left with nothing but questions and a briefcase with a curious old pen. They soon discover that the pen is far from ordinary - in the right hands, its magical Ink can be used to create anything imaginable.
But the Ink has dangerous enemies called Blotters, and soon Everett and Bea are running for their lives. Aided by Inklings, secret protectors of the Ink, Everett and Bea embark on a perilous quest across England and Scotland to track down a lost Inkwell that may be tied to their father's disappearance. The magic of the Ink helps create escape routes and clever disguises, but the Blotters won't stop until they've destroyed not jus the Ink, but Everett to save the day, but he can't seem to make the Ink work like everyone else can.
Will Everett find a way to draw upon the most magical power of all - his courage - before it's too late?