Starts off a bit slowly, but soon picks up to be as funny as anything. I'm particularly fond of the sofa.
I think I prefer the Dirk Gently books to the Hitch-hikers ones. The later tend to have more jokes per page but these are more coherent stories. Of the two I prefer Tea-time of the Soul but this is good too. Very readable and an easy style. Easy to forget how smart Adams was.
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...