Excerpt from Flashback by Nevada Barr, plus links to reviews, author biography & more

Flashing in the sun, she was as colorful as any fish. Her mask and fins were iridescent lime green, her dive skin startling blue. Though the water was a welcoming eighty-eight degrees in late June, that was still eight point six degrees below where she functioned best. For prolonged stays in this captivating netherworld she wore a skin, a lightweight body-hugging suit with a close-fitting hood and matching socks. Not only did it conserve body heat, but it also protected her from the sometimes vicious bite of the coral. Like all divers who weren't vandals, Anna assiduously avoided touching--and so harming--living coral, but when they occasionally did collide, human skin was usually as damaged as the coral.

Again she stayed with and played with the fish until her lungs felt close to bursting. Though it would be hotly debated by a good percentage of Dry Tortugas National Park's visitors, as far as she was concerned the "paradise" part of this subtropical paradise was hidden beneath the waves.

Anna had never understood how people could go to the beach and lie in the sand to relax. The shore was a far harsher environment than the mountains. Air was hot and heavy and clung to the skin. Wind scoured. Sand itched. Salt sucked moisture from flesh. The sun, in the sky and again off the surface of the sea, seared and blinded. For a couple of hours each day it was heaven. After that it began to wear one down as the ocean wears away rock and bone.

Two dive sites, twenty dives--the deepest over forty feet--and Anna finally tired herself out. Legs reduced to jelly from pushing through an alien universe, she couldn't kick hard enough to rise above the surface and pull herself over the gunwale. Glad there were no witnesses, she wriggled and flopped over the transom beside the outboard motor to spill on deck, splattering like a bushel of sardines. Her "Sunday" was over. She'd managed to spend yet one more weekend in Davy Jones's locker. There wasn't really any place else to go.

The Reef Ranger, one of the park's patrol boats, a twenty-five-foot inboard/outboard Boston Whaler, the bridge consisting of a high bench and a Plexiglas windscreen, fired up at a touch. Anna upped anchor, then turned the bow toward the bastinadoed fortress that was to be her home for another eight to twelve weeks. Seen from the level of the surrounding ocean, Fort Jefferson presented a bleak and surreal picture: an overwhelming geometric tonnage floating, apparently unsupported, on the surface of the sea.

Enjoying the feel of a boat beneath her after so many years in landlocked parks, Anna headed for the fort. The mariners' rhyme used to help those new to the water remember which markers to follow when entering heavy traffic areas rattled meaninglessly through her mind: red on right returning. Shrunken by salt and sun, her skin felt two sizes too small for her bones, and even with dark glasses and the sun at her back, it was hard to keep her eyes open against the glare.

The opportunity to serve as interim supervisory ranger for the hundred square miles of park, scarcely one of which was above water, came in May. Word trickled down from the southeastern region that the Dry Tortugas' supervisory ranger had to take a leave of absence for personal reasons and a replacement was needed until he returned or, failing that, a permanent replacement was found.

Dry Tortugas National Park was managed jointly with southern Florida's Everglades National Park. The brass all worked out of Homestead, near Everglades. Marooned as it was, seventy miles into the Gulf, day-to-day operations of the Dry Tortugas were run by a supervisory ranger, who managed one law enforcement ranger, two interpreters and an office administrator. Additional law enforcement had been budgeted and two rangers hired. They were new to the service and, at present, being trained at the Federal Law Enforcement Training Center in Georgia.

Reprinted from Flashback by Nevada Barr by permission of G.P. Putnam's Sons, a member of Penguin Group (USA) Inc. Copyright (c) 2003, Nevada Barr. All rights reserved. This excerpt, or any parts thereof, may not be reproduced in any form without permission.