Missing May (1993 Newbery Medal Book)

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.