Dirk Gently, the successful unsuccessful detective. Each case is viewed holistically, and holistically is taken to (and then beyond) the extreme. This case starts as a search for a missing cat but soon expands beyond whatever you were expecting due to Dirk's insistence on using his holistic approach.
Almost classic Douglas Adams I thought, although I read this back in 1988 and I might upgrade it to Classic DA on a re-read. The wit is there, the surreality is there, it just didn't quite hit the mark that The Hitchhiker's Guide to the Galaxy set.