Clive Cussler, Crescent Dawn. Cussler loans his adventure hero Dirk Pitt his antique roadster.

Leslie Charteris, Salvage for the Saint. Technically, Charteris didn’t write this Saint book. But it has his characters, and was ghostwritten based on a teleplay for the Return of the Saint series starring Ian Ogilvy. It’s such a well-written story that it’s one of just a few non-Charteris Saint adventures reissued as part of the massive Saint e-book reissue last year.

Martin Amis, Money. Amis, who’s appeared in other of his novels, meets his fictional protagonist in a bar.

Joseph Payne Brennan, the Lucius Leffing stories. Brennan is the Watson to Leffing supernaturally inclined Sherlock in this New Haven-based series.

Oh, and the Kinky Friedman mystery novels.