Not too spooky, this is an adorable book about the famed holiday, Halloween.  Gentle illustrations softly convey the sweet personality of the ghost Oliver, as he readies the house for his holiday guests.  He “dusts” the house, wakes the black cats, and delivers invitations.  The doorbell rings and he has human trick or treaters: a jack o’lantern and a cow.  What to do?  Scare them away, or invite them in?  They are “treated” to a wonderful party by Oliver.  The next morning Oliver finds a birthday invitation on his doorstep, to Jack (o’lantern)’s home!