Everyone who ever died is still here, just in a different part of here. Linda can communicate with them. And if you believe, she can make you hear them, too — in the thin place, the fragile boundary between our world and the other one. With acuity and relentless curiosity, Lucas Hnath’s play transforms the theater into an intimate séance, crafting an unnerving testament to the power of the mind, which has a mind of its own.