Kittens and midnight guest

One stormy night, an abandoned black kitten named Petr appears on the steps of the museum. How can he get closer to the kittens who know every nook and cranny of the mysterious museum? Simply, when the heart of a little hero beats in his chest! Petr and his cat Sasha embark on a dangerous quest to find a cunning thief, during which they encounter unpleasant trouble with a tyrannosaur. Will someone come to their aid?