On a flight from London to Boston, Ted Severson meets the stunning Lily Kintner. Over martinis, the strangers play a game in which they reveal intimate details about themselves. But what begins as playful banter between Ted and Lily takes a turn when Ted claims, half-seriously, that he would like to kill his wife. Then Lily surprises him by saying that she’d like to help. Back in Boston, Ted and Lily forge an unusual bond and talk about the ways Ted can get out of his marriage. But Lily has her own dark history she’s not sharing with Ted. As Ted begins to fall in love with Lily, he grows anxious about any holes in their scheme that could give them away. And suddenly the two are pulled into a very lethal game of cat and mouse, one in which both are not likely to survive when all is said and done.