The Arctic tern’s migration is legendary: it travels all the way from the Arctic to the Antarctic Circle every year. Franny Lynch is determined to track these threatened birds as a way to redeem a past filled with her own flight from tragedy and the people she loves. As the story unfolds against the backdrop of accelerating climate change, we learn of the parallel reason for her ice-saturated voyage. Swashbuckling ride on rough seas notwithstanding, this is an extraordinary novel with plenty of room for quiet meditation, one that explores grief and familial bonds. Proof that still waters run deep.