Isidore Mazal is 11 years old, the youngest of six siblings living in a small French town. He doesn't quite fit in. Berenice, Aurore and Leonard are on track to have doctorates by age 24. Jeremie performs with a symphony, and Simone, older than Isidore by 18 months, expects a great career as a novelist --- she's already put Isidore to work on her biography. Isidore has never skipped a grade or written a dissertation. But he notices things the others don't and asks questions they fear to ask. So when tragedy strikes the Mazal family, Isidore is the only one to recognize how everyone is struggling with their grief, and perhaps the only one who can help them --- if he doesn't run away from home first.