Every year they have met up for a vacation, but their time away is much more than just a bit of fun. Over time, it has become a lifesaver, as each of them struggles with life's triumphs and tragedies.

Sophie, Emily, Amy and Melissa have been best friends since they were girls. They have seen each other through everything--from Sophie's private fear that she doesn't actually want to be a mother despite having two kids, to Amy's perfect-on-the-outside marriage that starts to reveal troubling warning signs, to Melissa's spiraling alcoholism, to questions that are suddenly bubbling up around the paternity of Emily's son. But could a lie that spans just as long as their friendship be the thing that tears them apart?