The Dark Tide, by Andrew Gross, is currently 99 cents in the Kindle store and at Fictionwise, but should be free soon (maybe not today, but usually within a day or two of this type of release) in the Kindle store.
Book Description
On the morning Karen Friedman learns that her husband, a hedge fund manager, has been tragically killed, Detective Ty Hauck begins his investigation of another man's death in a suspicious hit-and-run in Karen's hometown. The two seemingly unrelated tragedies are about to plunge a beautiful widow and a determined investigator into a maelstrom of murder, vast sums of missing money, and international conspiracy.This special free edition includes an excerpt from Andrew Gross's newest novel, Reckless.
For those with a nook or mobile (sorry, ereader format only), check Fictionwise. I doubt they will drop all the way to free, but with the current MARCH2010 coupon for 10% off and a club membership, it'll only cost you 65 cents each and you'll get 29 cents back in micropay.