The Santiago Sisters. Victoria Fox

wished to perform a farewell song for Monsieur, and would it be OK if she and Emily interrupted morning service for a few moments to do so? Aubert thought it was a wonderful idea, and no doubt couldn’t wait to report back to Simone on how well her girls were getting along. Ha, Tess thought as she took her place in the pews, if only you knew.

      Minutes later, the assembly was called into chapel. Tess spotted Emily looking suitably worried. She was frantically reading through the sheet of handwriting, and each time Fifi or one of the others attempted to peek over her shoulder, she swiped them away, unwilling to admit she hadn’t a clue what words were written there. Emily could barely introduce herself in French, let alone tackle the complex structures Tess had toiled hard on, looked up in the library, and double-checked with a bunch of geeks in an online forum. Excitement surged in her chest.

      She didn’t have to wait long. After the school refrain had been sung in its usual dispassionate drone—’Aujourd’hui, nous sommes graines; demain, nous sommes des arbres’—and an announcement had been made about the forthcoming hockey tournament against the rival girls’ academy, L’École de Françoise Barbeau, it was time for Tess and Emily’s performance. Across the pews, Tess shot her a sweet smile.

      ‘Beloved Monsieur Géroux,’ crooned Madame Aubert from the lectern, as there was a general expectant shuffling in the ranks, ‘our girls in Special French wished to say goodbye to you in the way you taught them best. I think this is a lovely gesture and proves how much you mean to them—and to everybody here. So, without further ado, please welcome them to the stage: Tess Geddes and Emily Chilcott!’

      Emily hesitated and, for a horrible moment, Tess thought she wasn’t going to fall for it—but, at the last moment, she shuffled up to the front. She shot Tess a strange look, half gratitude and half loathing. It serves you right, Tess thought, remembering how her hair had been slashed, and every cruelty and unkindness she had suffered at Emily’s hands. You underestimated me. You all did.

      Tess saw Monsieur Géroux in the pews, his expression open with happy surprise. The piano struck up a lively tune. The song began.

      The first verse went without a hitch. The teachers beamed through all Tess’s carefully constructed sentences, praising Monsieur’s delightful teaching style and prowess on the instruments, and Emily mumbled alongside her, finally falling into the tune. Then something strange happened. As they hit verse two, Tess’s voice gradually receded. She turned to stare at Emily, a practised mask of disbelief on her face, as Emily continued to belt out the words, her cheeks flaming with the effort of her botched—but still, lamentably, understandable—pronunciation, and when she realised she was singing out of kilter with Tess she sang even louder to make up for it.

      ‘Emily …!’

      An elfin blonde named Claudette squeaked from the ranks, as Emily’s clique, including Fifi, turned ashen, along with the professeurs. Emily, thinking the shout had been some show of support, continued to sing as clear as a bell, her voice ringing out above the music, before suddenly, at Madame Aubert’s signal, the piano stopped. Emily’s voice travelled alone to the end of the refrain, and then fizzled out.

      The congregation was staring, appalled. A few nervous laughs rose up from the chapel. Madame Aubert rushed over, red and flustered. Without a word she snatched Emily by the elbow and led her off the stage. Tess followed. On the way down they passed Monsieur Géroux, whose eyes were trained on the floor. The tips of his ears were bright red. Tess could sense the gaze of every girl boring into her.

      ‘Vous horrible fille!’ Madame Aubert lambasted Emily when they reached the courtyard. ‘What were you thinking? Was that some kind of joke? Allez au bureau de la directrice, immédiatement! Until then, consider yourself a month in detention!’

      ‘But—’

      ‘No buts, young lady.’

      ‘I don’t—’ Emily turned to Tess, but Tess gave her nothing. ‘But she … I—’

      ‘Go. Now!’

      When Emily had scurried off, Tess said, ‘I’m sorry about that, Madame. I don’t know what got into her. It must have been some prank she and Fifi thought up. I mean,’ she blushed, ‘not to wrongly implicate anyone, it’s just I saw them talking outside and giggling over something. Emily was fine in rehearsal.’

      Madame Aubert, who hadn’t been sure whether or not to be cross with Tess, thought a moment then shook her head. ‘Don’t worry, ma chérie,