It looks like young Keith Gridley will have a lonely summer, until he meets a talking mouse named Ralph. Ralph takes an immediate liking to Keith's toy motorcycle and can ride it just by making a motor noise. Ralph even acts heroically when Keith comes down with a nasty fever, while dodging cats, owls and a guest's noisy dog.

It's been some time since Father Jebedaiah Mayii exorcised the Devil from little Nancy Aglet, who is now grown up with a husband and two children of her own. But the prince of darkness wants to go a second round and has returned to repossess her! With Father Mayii unwilling to help, Father Luke Brophy tries his best to help Nancy, even when TV's Ernest Weller plans to air the exorcism live on TV.