Three months after her husband Matt's death, young widow Leigh struggles to put the pieces of her life back together, in the process clashing with her mother Amy, her sister Jules, and Matt's brother, Danny.
Leigh encounters another young widow in grief group who makes her insecure about the way she expresses her emotions, and forces her to reckon with how well she knew her husband.
Leigh finds a stray dog, which brings back memories of the dog she shared with Matt. These memories track major milestones of their relationship and provide the clue which lets her unlock Matt's phone passcode.
Upon unlocking Matt's phone, Leigh discovers 17 unheard voice messages. As she delves into them, we launch into an episode entirely from Matt's perspective, culminating in the final days of his life.
Determined to take back her life, Leigh throws herself a last-minute birthday party, inviting everyone she knows, and blurting out a question to Danny that cuts the night short.
Despite Danny's warnings to leave his mother out of her search for answers, Leigh reaches out to her mother in law for the first time since Matt's death.
Leigh is desperate to get through her best friend's wedding without falling apart. To her surprise, the day is as difficult for Danny as it is her, and their bond culminates in an intimate moment that shakes Leigh to her core.
A surprise discovery about Matt's final week gives Leigh and Danny an opportunity to make Matt's dream come true, but in the process, throws their relationship into jeopardy.
Leigh is surprised to find herself drawn to a stranger and goes on her first date since Matt died. Jules shows up at the wrong location for AA, which leads her on an adventure of her own.
Danny has disturbing nightmares about his brother, and Leigh can't write her final essay until she gets the truth out of him. Tommy forces Jules to face her deepest fear.
