2006: "A Delightful Romp". Result: Put A Lid On It by Donald E. Westlake. A good choice.
2007: "Could Not Put It Down until The Final Thrilling Page". Result: The Redhead scribbled "Marry, I could nae put it down" on a copy of Erewhon, and I had to amend the rules to point out that it doesn't count to do that.
This year: "The cleverest whodunnit to come along in ages!" Result: hit the jackpot!
Trial by Fire, by DW Buffa
The Appeal, by John Grisham
Vendetta by Michael Dibdin (This one had already been recommended to me, and I know the library does not have it, so bonus points to my father in law!)
A Question of Proof, by Nicholas Blake
Resurrection, by Steve Allen
The Mammoth Book of Roaring Twenties Whodunnits, edited by Mike Ashley.