The story of Peggy, Buckaroo's soul-mate and momentary wife, is developed in great detail in the book. In love since college, and married for barely 1/2 hour, their pairing torn apart by Peggy's brutal murder, accomplished with cyanide in a bouquet of wedding flowers. Or was it murder? The catspaw, Captain Happen, let fall a cryptic remark to the effect that "Peggy's alive!" just before he hurled himself from the window of the church, exposed by the BB's ruse of a "seance" to call up Peggy's spirit, with Mrs. Johnson playing the part of Peggy's "ghost". Autopsy reveals a small radio receiver implanted in the Captain's brain, through which he was being manipulated, probably by Xan, Buckaroo's arch-nemesis, known to the CIA as Hanoi Xan. Xan and Buckaroo are yin and yang, Osiris and Set, Light and Dark......Xan killed B Banzai's parents in an explosion at the first Jet Car test in 1955...Xan thinks he is using Dr. Emilio Lizardo, who he believes to be insane, to harass B Banzai, not understanding that Lord John Whorfin is using him... anyways, Peggy's coffin is exhumed, revealing...nothing!. The coffin is empty! So what happened to Peggy?

Extremely rare Banzai family photographs - Buckaroo with his parents and with his wife, Peggy

This is part of the mystery of Penny Priddy...Peggy's sister, separated from her in a fire which killed their parents when they were both young. Is Penny really Peggy's sister? Is she the brainwashed "death dwarf" of Hanoi Xan? Reno, the official chronicler of the exploits of B Banzai, continues to probe this mystery, much to the amusement of the other Cavaliers... [see also Extradition from Hell, wherein Reno addresses the evidence of Peggy's murder] Penny Priddy - who is she, really?

this is a footnoted explanation from the book of a cryptic comment Rawhide makes as he is dying, regarding "the penny paradox"...
[Reno writes]
"... What did Rawhide mean by this? We would have no shortage of theories. Was he referring to Penny Priddy or to the penny paradox so familiar to science buffs and which can be roughly stated in something like the following terms: Since the same part of the moon always faces us, does the moon rotate on its axis as it circles the earth? The same question can be elucidated using a pair of pennies or any round objects:

If a penny is rotated about a second one that is fixed in place, the question is: Does the first penny rotate once or twice around its axis when revolving around the second penny? For an observer who watches both pennies from above, the first penny rotates twice; for an observer on the fixed penny, only once. Therefore, to the eyes of an observer on the earth the moon does not rotate, although it rotates once in relation to the stars.
So what did Rawhide intend to say? Could the "penny paradox" in some way be connected to the riddle of Penny Priddy? I believe so, and the reader will learn of my theory in a future work."