When a young brewery boss is found dead, a chain of events is triggered that draws four of his employees—Anna, Nancy, Louie and Cat—into a fragile pact of silence, bound by a secret that will change their lives forever.

Christine Rees and her adult children—Megan, Will and Jamie—are still processing the loss of their beloved son and brother Liam, when they are contacted by a mysterious stranger who claims to be a fifth, previously unknown, Rees sibling. Christine seems like she knows more than she’s letting on, which leads to divided feelings a...