Gustav Is Missing!, A Tale of Friendship and Bravery, Random House Children's Books, Andrea Zuill,Humorous Stories,JUVENILE FICTION, funny books for kids;funny kids books;introverts;making friends;friends;friendship;friendship gifts;kindness;kindness books for children;social emotional books for kids;social skills for kids;feelings books for children;empathy;kindness books;friendship book;friendship books for kids;anxiety relief for kids;growth mindset books for kids;self-esteem;self esteem books for kids;summer books for kids;picture books;books for 6 year old girls;books for 6 year old boys;books for 7 year old girls,, , United States, en-UShttps://www.penguinrandomhouse.comfunny books for kids;funny kids books;introverts;making friends;friends;friendship;friendship gifts;kindness;kindness books for children;social emotional books for kids;social skills for kids;feelings books for children;empathy;kindness books;friendship book;friendship books for kids;anxiety relief for kids;growth mindset books for kids;self-esteem;self esteem books for kids;summer books for kids;picture books;books for 6 year old girls;books for 6 year old boys;books for 7 year old girls, [BLURB],[CITY],,books, ebooks, biblet, Book2look