Call it a "hook" or a "pitch" or whatever you'd like, but make sure you nail it in time for the Baker's Dozen Auction submissions!
First, READ THIS POST about writing loglines.
Next, read these helpful tidbits:
From Blake Snyder's Save the Cat:
"A logline is the one- or two-sentence description of your [novel] that tells us what it is. It must contain a type of hero (that means a type of person plus an adjective that describes him), the antagonist (ditto), and the hero's primal goal. It must have irony, and it must bloom in our brains with potential."
From author Holly Bodger, the logline queen:
"When [MAIN CHARACTER] [INCITING INCIDENT], he [CONFLICT]. And if he doesn't [GOAL] he will [CONSEQUENCES]."
Please remember that there is no perfect formula for a logline. There are components that a strong logline needs, and this will flesh out in whatever way best portrays your story and its inherent conflict.
We will be having three logline critique sessions on the blog. Submissions for the first one will be this coming Tuesday, September 27. It will be a lottery with a large submission window, so you won't have to hover over your mouse. Forty loglines will be chosen at random and posted on the blog on Wednesday the 28th.