Sam Green's wish to have his birthday every day comes true, but the endless celebration quickly turns into a nightmare. Sam loves birthdays more than anything, cherishing the presents, parties, and cake. When his wish is granted, he initially revels in the repeated festivities. However, the constant repetition soon leads to unforeseen problems and a looming disaster that threatens something he values even more than birthdays, forcing him to confront the consequences of his desire.

The book is presented as a hilarious and entertaining read for children aged 9 and up, combining wish-fulfillment with heart and humor. The premise of a repeated birthday is designed to appeal to young readers' imaginations, offering a cautionary tale about appreciating what one has. The collaboration between David Baddiel and Jim Field suggests a blend of engaging storytelling and visually appealing illustrations, characteristic of their previous works. This combination aims to create a memorable and enjoyable reading experience for its target audience.