It's possible that the teacher had an accident on the way to school. Or there might be some work - related problems that made them need to go somewhere else without prior notice, like an important meeting or an emergency at another school site.
We could also try to recall the last time we saw the teacher and any unusual things that might have happened then. For example, if the teacher mentioned going somewhere specific or meeting someone. And we should stay calm and not spread unfounded rumors, which could cause unnecessary panic.
I'm not sure specifically as I haven't read it in detail. But it might be about themes of lost love, lost opportunities, or missing elements in people's lives.
First, create interesting characters. The students should have a believable motive for the blackmail, like unfair treatment they think they received. Then, build the plot around how the teacher reacts. Maybe the teacher has a secret power that makes the blackmail ineffective.
I'm not sure specifically as I haven't read the novel yet. But usually, the main characters are the ones who drive the story forward and are most affected by the central theme of the missing hearts.
Well, often in novels, the title gives a hint. 'Our Missing Hearts' might be about the parts of ourselves or our relationships that have gone astray. It could be about the search for those missing elements, whether it's emotional fulfillment, a lost connection with someone dear, or a piece of our identity that has been misplaced in the chaos of life.