Reserved history teacher Fran has long had a strained relationship with her eccentric, free-spirit mother Mim. When Mim announces that she is dying Fran feels obliged to accompany her on a road trip ticking off items on her bucket list.
Mim lets slip a crushing deception, and Fran calls an end to the trip, but it looks like time might be running out for Mim to tell Fran the biggest secret of all.