When May dies suddenly while gardening, Summer assumes she'll never see her beloved aunt again. But then Summer's Uncle Ob claims that May is on her way back — she has sent a sign from the spirit world. Summer isn't sure she believes in the spirit world, but her quirky classmate Cletus Underwood — who befriends Ob during his time of mourning — does. So at Cletus' suggestion, Ob and Summer (with Cletus in tow) set off in search of Miriam B. Young, Small Medium at Large, whom they hope will explain May's departure and confirm her possible return.