Lu, Rio and Pelle are booked to organise another birthday party: but Enna, whose birthday they want to celebrate, is not at all in the mood for a party. Her grandma has recently died and now Enna is sad whenever she thinks about her. But the Birthday Gang come up with a perfect idea: they plan a Día de Muertos party, similar to the cheerful Mexican festival they heard about at school. Wouldn’t their new biology class skeleton be the perfect decoration? But how can they smuggle it out of the school building unnoticed? And then suddenly there's a second party to organise. Will Lu and her two friends manage to take care of both events? The third volume with the Birthday Gang celebrates life and the sheer luck of having best friends - a feel-good friendship and adventure story for young readers aged 8+.