Following a one-night stand with a man named Alex Sokolov, flight attendant Cassandra Bowden awakes to find him dead in the bed next to her, with no memory of the night before. She cleans up the room and tries to get back to the United States, but is haunted by hallucinations of the dead man, even as she tries to pretend that everything is alright.

Rattled by her own lies and under pressure from the FBI, Cassie goes against Annie's advice to lay low and tries to find some answers by digging into Alex Sokolov's work life - with bizarre and shocking results.

Returning from Rome to find someone has broken into her apartment, Cassie doubles down on finding Miranda - even if it means crashing Alex Sokolov's champagne-soaked memorial service at his family home.

After piecing together evidence with help from Annie's not-boyfriend Max, Cassie follows the paper trail to a suspiciously empty private jet manned by Nate, her on-again, off-again flight crew fling. Meanwhile, Megan attempts to hide her shady dealings from her family, and Annie faces a reprimand from her boss, Diana. Later, a visit from her brother Davey and his family forces Cassie to confront her memories of her "unconventional" childhood.

With Miranda on her tail and the FBI closing in, Cassie enlists Max in a plan that involves breaking and entering, computer fraud, and too much vodka. Meanwhile, Annie is forced to repay an ominous favor to a client, and Megan's secrets threaten to come to light.

Reeling from a major fallout with Annie - and running from anything related to Alex - Cassie brings Buckley along for an alcohol-fueled escapade that ends in a meltdown. Meanwhile, Megan embarks on a clandestine mission, and, amid mounting pressure from her co-conspirators, Miranda continues to hunt Cassie down.

Cassie is forced to work with a surprising new ally as she reconsiders all that's happened since Bangkok. Meanwhile, Megan's life begins to implode when her husband faces consequences for her actions.

Cassie comes face to face with Alex's hugger. Annie works with the FBI. Megan comes clean.