Just finished "Pendergast The Beginning" which was a prequel to Relic, the start of the Lincoln and Childs Pendergast series. I enjoyed it, but if I recall correctly, people on this board didn't really enjoy Relic when I suggested it a few years ago.
The Pendergast series is a 23 book thriller series that blends crime, horror, and science fiction genres. Of the 23 novels, 20 were on the New York Times bestseller list. Pendergast is a quirky FBI agent with Sherlock Holmes like attention to detail. The authors often highlight that by having him lay back when others do the initial crime scene investigation and then later have him highlight details that often they either missed or saw but didn't understand the relevance.
Each book is arguably a standalone, but there are overarching storylines including two interconnected "sub trilogies." Pendergast, The Beginning is a good introduction to the series, because, though it is the most recent book, it would be the first if you listed them by timeline within the series.