Zoe and her brother Jason have been studying at St. Adeline Catholic School for many years, and they are well aware of all the requirements that their teachers make. Strict rules here border on encouraging hard work and a desire to study well. Everything goes on as usual, until a new teacher appears in the new year. A nun from the very beginning behaves too suspiciously and is very different from other teachers. She uses makeup, does not do any homework and refuses to carry out checks.