Some days, Luka the blue whale doesn't feel happy at all. He gets angry, he's sad, he cries until the ocean is salty.His friend Jenny wants to help Luka, but how?Luckily, a wise mermaid might know what to do... This lovingly illustrated picture book gently introduces children to the symptoms of depression and gives advice on how to help others who're feeling blue. This book is recommended for:Children with parents, siblings, friends or relatives suffering from depressionChildren who show symptoms of depression and low moodAdults of any age who want a simple and relatable insight into what it's like to have depression.