Sadie and her friends have succeeded: they have defeated the Marked of the Serpent in the great battle. However, due to a series of unfortunate circumstances, no one takes their reports seriously, and Leon, that traitor, remains undetected despite their efforts. Unfortunately, there isn't enough time to gather more evidence, as the students of the House of Talents are flying to the International Junior Vampire Games in Sardinia, where vampires from all over the world compete in various contests. When so many vampires gather in one place, trouble is practically guaranteed. Yet, the friends have no idea what tragedy awaits them all. And Sadie must realize that Lord Apophis's influence is spreading further than expected. His Marked of the Serpent are always nearby, waiting for the perfect moment to strike, and Leon is helping them….