Fifteen-year-old, Sarah Taylor, the sole caretaker of her family, discovers that she has an unlikely talent for stand-up comedy and must come-of-age while balancing the responsibility she has towards her family with her newfound passion.

When her best friend Elizabeth goes missing, Maud (Glenda Jackson) is convinced something terrible has happened. But her search to find Elizabeth unearths an altogether darker unsolved mystery: her sister's disappearance, long buried in the recesses of her memory. Can Maud discover the fate of both missing women before her dementia erases the clues? Based on the novel by Emma Healey.