Cassie is living her best life in Los Angeles, has a supportive new boyfriend, and moonlights as a CIA asset. When her latest assignment makes her an eyewitness to a murder, Cassie becomes entangled in another international mystery.

Cassie reveals her secret to Annie and Max, and sets out to find her mysterious impersonator and suspects the new flight attendant, Grace. Annie prepares for a career-changing interview. Cassie's friends celebrate her year of sobriety.

A cryptic text leads Cassie to search for Megan in Reykjavík, where Shane grows increasingly suspicious of his friend's erratic travels. Back in LA, Annie and Max face unexpected turbulence.

After attempting to get Megan safely out of Reykjavík, Cassie fears she's being framed for murder when two bodies are found in Echo Park.

After finding potentially incriminating photos in Benjamin's office, Cassie seeks assurances from Shane - and continues to avoid Marco - while Megan searches for an all-important lockbox.

Cassie faces hard truths about her path to sobriety while visiting her mom. Megan attempts to reconnect with her own family, who are reluctant to welcome her back.

Cassie, Shane, Annie, and Max attempt to run down clues in the string of murders - which continue to point to Cassie as the main suspect.

Cassie manages to connect the dots in a far-reaching conspiracy, while Megan tries to make amends with Shane.