The Prisoners of the Thirteenth Floor — Michael Dahl

Charlie finds himself on the hidden 13th floor of the Abracadabra Hotel. He discovers both Tyler and the magician Brack. Brack was trapped there by a mysterious figure he could not identify. As they search for another way out, they find rooms that house old magic props from previous shows decades ago. One room contains twelve statues of the Olympian gods, brought over from Greece fifty years earlier. When the three friends escape from the 13th floor, the story is all over the news. It turns out the statues are priceless artifacts. And someone in the hotel is after them.