In Lisa Jackson and John Sandford's "Deserves to Be Dead," cop Regan Pescoli meets Virgil Flowers of the Minnesota Bureau of Criminal Apprehension. Regan Pescoli is the protagonist of a series of novels by Jackson. Sandford’s Virgil Flowers series is in the CU through connections to his character Lucas Davenport, who is himself in the CU through Stephen King and Peter Straub’s Black House. Flowers reports to Davenport, and the two frequently appear in each other’s series.
In Diana Gabaldon and Steve Berry's "Past Prologue," ex-government agent turned bookseller Cotton Malone meets eighteenth century Scottish soldier Jamie Fraser through time travel. This crossover brings together Jamie Fraser from Gabaldon’s Outlander series and Berry’s series character Cotton Malone, both of whom have independent links to the CU.
Lastly, in Kathy Reichs and Lee Child's "Faking a Murderer," Child’s character Jack Reacher helps to clear the name of Reichs’ forensic anthropologist Dr. Temperance Brennan when she is accused of murder. Reacher is in the CU. Reichs’ Temperance Brennan novels are the inspiration for the television series Bones, which is also in. The Dr. Temperance “Bones” Brennan of the TV show is a generation younger than her literary counterpart, and has a completely different family tree, supporting cast, and background, so this must be an AU.
These crossovers are four of hundreds covered in my book Crossovers Expanded: A Secret Chronology of the World Volume 3, which will be published by Meteor House! All three volumes are AUTHORIZED companions to Win Scott Eckert's Crossovers: A Secret Chronology of the World Volumes 1 and 2!