Father Dowling's brother Blaine is back in town and once again causing him havoc. Frank is framed for a bank robbery that happened at the exact same moment that Blaine was being arrested for overdue parking tickets, giving him a perfect alibi. Frank's only hope to clear his name is to pretend to be Blaine to infiltrate his brothers associates and prove that Blaine was the mastermind behind the robbery.
When warring exterminators fight for franchise rights, Frank and Steve are caught in the middle. Confusion ensues when they discover a phony nun, a dangerous hit man, and a gangster who will stop at nothing to save his daughter's life.
When a witness who can clear a young man of murder goes missing, Sister Steve goes undercover as a working girl to find her. But is the young man as innocent as he makes out? Father Dowling is not so sure.
Father Dowling has received the shock of his life. A young man has shown up at St. Michael's Parish claiming to be his son. Before Frank can get to know his son, he vanishes, then is charged with murder. Can Father Dowling save his son from the murder charge?
When a hitman hired to kill Frank realises he is a Catholic priest, his Catholic faith won't allow him to go through with it, and he warns Frank that someone will takeover the hit and carry it out. Father Dowling must figure out why someone would want him dead and who is behind it.
When Father Dowling and Sister Steve discover an ancient Egyptian curse while visiting a Pharaoh's burial chamber at the Chicago museum they attempt to uncover the mystery surrounding the statue given to Frank from the murdered man. Father Prestwick also visits the tomb with almost deadly consequences!
When a chimp Sister Steve has known and loved since childhood is accused of murdering a zoo keeper, she steals him from the zoo to prevent his execution. Sister Steve and Father Dowling then go about finding the real killer and clearing the chimps name.
A mystery writer, who is writing a new novel starring Frank and Steve as characters, dies before completing the book. It is up to Frank and Steve to investigate his murder, thus writing the last chapter.