A Ghost in the Window by Betty Ren Wright

A girl's scary dream may come true in this "fast moving" story starring "a likable and believable heroine" (School Library Journal).
Meg's nightmare about a thin, gray-haired man who beckons her to follow him through a dark doorway will no doubt come true. That's the way it is with all of her "real" dreams, the ones that her grandmother calls "a secret window into the future."

Meg suspects that her dream is about sixteen-year-old Caleb Larsen's father, who died in a car crash after allegedly stealing $50,000 from a local bank. Could Mr. Larsen be trying to reach Caleb and his mother through Meg's dreams? Is he trying to reveal the truth about what happened? As Meg's nightmare begins to come true, she learns to cope with her own past as well as Caleb's, and to see the present in a different, more positive light.