When the lights suddenly went out at the Portal Hotel, Charlie and Amelia were not afraid. Just think! They deal with aliens and the supernatural on a daily basis, and they cannot be scared by that. The only thing is that meeting guests in such conditions is not the best idea. But the arrival of twenty aliens disguised as ordinary children cannot be postponed. Only Amelia and Charlie did not receive a complete list of guests; they did not know that that night Krskin himself would show up at the hotel - a terrible monster from outer space, whose atrocities are legendary. It seems that a power outage is not a breakdown or an accident, but a trap!..