Best friends on summer holidays = speed, excitement and humor! Milla and Filla are best friends. They spend every day together. And when Filla finally gets to go with Milla to their summer cottage, they know it's going to be a super summer! Things start to look even better when they hear there's a treasure on the island. Milla decides they must find the treasure. But then along comes Otto, who claims to own everything on the island – even the treasure, if they happen to find it! That's when Milla makes a plan… Milla hunts for gold by Selma Lønning Aarø and Tiril Valeur is a loose follow-up to their charming, popular story Milla decides.