Jane is rushing from work to her daughter Charlotte's dive competition when she receives a phone call. Her mother Shirley, 75, has had a fall in a shoe shop. Jane reluctantly leaves Charlotte and the competition, but soon discovers that things aren't what they seem. Shirley and Jane have an epic showdown that twists and turns as their flaws and truths are exposed. As the competition clock ticks, the two formidable women make-up and hurry back, just in time to catch Charlotte's big dive.