Hope this helps.

I believe that being teased is exactly what most agents want in a query--or more accurately they want you to sell them that the rest of the book is worth reading. This does not apply to the synopsis if they want one.

Here are some links that I consider very worthwhile on writing a query, In particular, I think Ms. Nelson's "Pitch Workshop" series is helpful:

http://pubrants.blogspot.com/2007/10/pitching-and-all-that-jazz.html

Agent Nathan Bransford's take on the subject:

http://nathanbransford.blogspot.com/2006/11/anatomy-of-good-query-letter.html

And two downloads from agent Noah Lukeman (Click to the Query page and he'll tell you he doesn't take them but he'll give you two free downloads with some great query and agent seeking suggestions):

http://www.lukeman.com/def2.htm

quote:

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This does not apply to the synopsis if they want one.

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The synopsis must include plot twists and tell how the story ends. One of the purposes of the synopsis is to tell the editor or agent that you know how to finish a story satisfactorily.