Ghosts, Thieves and Aha! Adventures (Silly Billy series)

When Ashish has to go to his mother’s workplace after school, he is sure he is in for the most boring time ever. But he couldn’t be more wrong! His mother, Ruth, works in a bookstore where Ashish must team up with Kavya—the owner’s niece—to catch a bookshop ghost and nab a bookstore thief. Will they succeed?