Gatsby's Grand Adventures Book 3 Girl with Pigs

Gatsby lives with his absent-minded mistress Miss Annabelle in an art gallery. He explores famous paintings at night. If he remembers to jump out before dawn, the painting remains the same. But sometimes, Gatsby forgets and that's when strange things happen to Thomas Gainsborough's painting, "GIRL WITH PIGS".
Suggested age range for readers: 7-12