The House with No Keys Calendar But just as their relationship

But just as their relationship takes flight

an assassin is summoned to the castle

But when Austria declares war on Serbia and Russia's Imperial dynasty begins to fall

The threat of war has arrived at Diem's doorstep

The House with No Keys Calendar But just as their relationshipThe Delta Games, Book #2 This sequel to the New York Times bestselling book The Mystery of Locked Rooms follows the beloved Deltas as they race to complete the most challenging escape room they've ever faced and confront their fears in order to save their friendship. When a strange invitation shows up in Sarah's backpack, the Delta's learn that their favorite funhouse, The Delta Game, is about to get some serious competition. The "Mystery Mansion" is