Jax meets Liv, the new girl at school who shares his love of music, but that's not all they have in common ... Jax has big plans for grade eight: seeing if his maybe-girlfriend, Samantha, will become his actual girlfriend, and being first trumpet in the school band. Enter Liv, the new girl Jax meets at band auditions. Liv's a star on the trumpet too. In fact, she might be better than Jax. When Jax and Liv start rehearsing together, they go from duet partners to fast friends. Soon, they learn that they share something more than a love of music — something that will change their whole world and make them rethink what it means to be "family."