When Tina Turtle's library card vanishes on the very day her long-awaited architecture book arrives, Adventure Koala and the S.A.R.T. team leap into action! Following a trail of clues through bakeries, boutiques, and hardware stores, they discover more than just a missing card – someone has been mysteriously tracking Tina's every move! What secret could be hidden within the pages of an ancient architecture book that would make someone so desperate to find it first? A charming tale of friendship, detective work, and an unexpected historical treasure!