Leap Year by Andrea Fine Carey
Four strangers wake up to find themselves in a room with a large box but no doors or windows. Then things get weird. They discover they share the same age and birthday (Feb 29), but they live in different time zones and different decades, ranging from the 1950s to the 2020s. The box provides various gifts and clues, depending on how well they resolve conflict. In the end, their escape depends upon all four...
Four strangers wake up to find themselves in a room with a large box but no doors or windows. Then things get weird. They discover they share the same age and birthday (Feb 29), but they live in different time zones and different decades, ranging from the 1950s to the 2020s. The box provides various gifts and clues, depending on how well they resolve conflict. In the end, their escape depends upon all four characters cooperating together, even when it becomes uncomfortable—or dangerous.