I have no idea why, but this has been on my shelf for a long time and I knew it was left over from a previous MN Book Swap, sorry! 
Did not manage to finish it, although I did get well over half way. I had the same issues as itsatiggerday, which was that the detective element of the story was not a strong enough storyline and I kept losing myself between reads.
However, Lionel is a brilliant character - I was fascinated by the tics (quite topical at the moment following the publication of Jessica Thom's book) and there were some genuinely laugh-out-loud funny bits! Its almost a shame he was not in a book which showcased him better!
Do you want your copy back, Saladbomb?