A tiny tear in space, so small that no one has ever come across it...until now. The tenth Doctor...the eleventh Doctor...the twelfth Doctor. Rose, Rory, Amy, Martha, Donna, Clara. All stuck in the same moment of time...which isn't going to last much longer. Someone--or something--wanted all of them there...and doesn't want them to get out. They have only hours to figure out how to break the lock on the TARDISes, or else the tiny pocket universe they're trapped in will implode...with them in it. The only mistake that their enemy made? They sent not one, not two, but three Doctors to the same place.