Dear Ms. Snark,
What is the proper way to query a book that ends on a cliffhanger? Would an agent prefer any sort of progress made on the other novels in the series, or is a first installment, if it's interesting and well done, enough to get represenation?
You're joking right?
Ending a book on a cliffhanger?
Are you NUTS?
The closest you can come is something like Janet Evanovich did with one of her books when she didn't name the guy who said "take it off", but that was a little teaser, and it was SEVERAL books into a successful series.
You query me with something like this and I can end the suspense really quickly about whether it's right for me.