Race the clock with biologists as they try to figure out why North American loons are suddenly in danger. Unlock the mysterious lives of these beloved birds, and ponder whether their cries will continue to be summer's soundtrack or go silent forever.

Race the clock with biologists as they try to figure out why North American loons are suddenly in danger. Unlock the mysterious lives of these beloved birds, and ponder whether their cries will continue to be summer's soundtrack or go silent forever.