Gigantic meteor impacts have been a familiar SF cliché for decades. Jack McDevitt (whose first SF novel appeared in 1986) rings the changes with a two-stage disaster. A sun-grazing comet from deep space becomes visible only during the 2024 eclipse: it\'s a planet-killer, too big and fast for interception, and impact is in just five days. The twist is that it\'s going to hit the Moon. Lashings of drama follow as our lunar base--just opened by the US Vice-President, who\'s still there--is desperately evacuated by a Dunkirk flotilla of moonbuses, spaceplanes and a prototype Mars ship. At last the incoming monster, 180 km across, smashes into the Moon: as though this were a violent first break in snooker, random fragments fly everywhere. With grim plausibility, McDevitt shows the US government initially spin-doctoring the problem as nothing much to worry about. Then the sky begins to fall ... 37 chunks of Moon spawning fireballs and floods, and a massive 38th that threatens global extinction. The last-ditch effort to tackle this--not using nukes--attracts a sabotage strike from US militia loons who reckon it\'s all a government plot. McDevitt mercilessly cranks up the tension, and the pages turn faster and faster. A highly competent technothriller. --David Langford