Возвращение Мухтара S11E44 - Как с неба свалился

Is it possible to achieve a noble goal by unworthy means? Antonina goes to her ex-husband with a request to get their offspring out of jail. He agrees to help and discovers that after Antonina leaves, a large sum has disappeared from the safe. But she couldn't have committed the theft alone! Who helped the woman steal the money?