क्यूंकि वो बीवियां बदलते थे (Vibha Jindal #4)

Kyonki Woh Beewiyaan Badalte Thay (because they swapped wives) contains a series of murders of sons and daughters-in-law of big business families in Delhi. Since the daughter-in-law of Bajaj family - Chaandni is the friend of Shagun (author's son), she approaches the author, requesting them to pursue Vibha Jindal to investigate this case (because Vibha has earned a name not only in the field of business and industry but crime-detection also and she commands a respect in the top brass of the police department as well). How Vibha investigates the case with the author and his son forms the major part of the novel and the murderer turns out to be someone whom the reader cannot think of even in the wildest of his dreams.