For Alex Mercer, his wife Millicent and their eleven-year-old son Max are everything, his little tribe that makes him feel all's right with the world. But when he and Max find their enigmatic next door neighbor dead in his apartment, their lives are suddenly and irrevocably changed. As the police conduct a methodical investigation, Alex becomes increasingly impatient for them to finish. After all, it so clearly was a suicide.

But as new information is uncovered, troubling questions arise. Why was the neighbor charging his home improvements to the Mercer’s address? How did a possession of Millicent’s end up in his apartment? And what has Max been listening to through the common wall they share with the neighbor? As the knot of suspicion grows tighter, this close-knit family begins to crack. Is Alex really the loving husband he professes to be? And where does Millicent disappear to on those long walks, stewing over something she can't forget?

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