Day eighty had come, and only seven had reported in. The others immediately stopped heading any further away if that was the course they’d been set on; four days later, still with no word, and with no sign of anybody else having heard anything, the seven remaining ships of the Fifth fleet set their courses to converge on the last known position of the missing ship and accelerated to their maximum speed. The first of them had arrived in the general volume where the Peace Makes Plenty ought to be five days later; the last one appeared another twelve days after that.

They had to assume that the ship they were looking for had not travelled at that sort of speed since it had last signalled, they had to assume that it had been cruising, even loitering amongst the systems it had been investigating, they had to assume that it was somewhere within a stellar system, small nebula or gas cloud in the first place, and they had to assume that it was not deliberately trying to hide from them, or that somebody else was not deliberately trying to hide it from them.

The stars themselves were relatively easy to check; microscopic as it might be compared to the average sun, a half-million tonne ship containing a few tonnes of anti-matter and a variety of highly exotic materials falling into a star left a tiny but distinct and unmistakable flash behind it, and usually a mark on the stellar surface that lasted for days at least; one loop round the star could tell you if that kind of disaster had befallen a missing craft. Small solid planets were easy too, unless a ship was deliberately hiding or being hidden, which of course was perfectly possible in such situations and considerably more likely than a ship suffering some natural disaster or terminal technical fault. Large gaseous planets presented a bigger challenge. Asteroid belts, where they existed, could pose real problems, and comet clouds were a nightmare.

In the vast majority of solar systems the spaces between the inner system and the comet cloud were easy to search for big, obvious things and pointless to search for small things or anything trying to hide. Interstellar space was the same, but much worse; unless something was trying to signal you from out there, you could more or less forget about finding anything smaller than a planet.