Lilly (Melissa McCarthy) and Jack (Chris O'Dowd) are a happy couple, expecting their first child. But when Lilly experiences a miscarriage, it tears them both up. Chris struggles with the loss so desperately that he winds up in therapy at a mental health facility.
While checking up on Jack, Lilly is referred to a former colleague of one of the facility's employees to seek her own help. It turns out that this former colleague now works as a veterinarian after leaving the mental health field 10 years ago. Meanwhile, a starling who insists on hanging out out in Lilly's garden slowly changes her outlook on life.