He hadn't learned a hell of a lot, he thought. He'd known that Duckworth had gone to Mendez, and he already had the Hotel Byron address. There was, however, some negative information there. The last address they had was on Mendez, and yet Scholar Duckworth couldn't be found on Mendez. Obviously, he had not filed a change of address there; just as obviously, he had managed to leave the planet without a trace. There was always the possibility that he'd been killed, of course. On a thinly populated world like Mendez, murder could still be committed with little chance of being caught. Even here on Earth, a murderer with the right combination of skill and luck could remain unsuspected. But who would want to kill Scholar Duckworth? And why? Turnbull pushed the thought out of his mind. It was possible that Duckworth was dead, but it was highly unlikely. It was vastly more probable that the old scholar had skipped off for reasons of his own and that something had happened to prevent him from contacting Turnbull. After all, almost the same thing had happened in reverse a year ago. Outside the Terminal Building, Turnbull walked over to a hackstand and pressed the signal button on the top of the control column. An empty cab slid out of the traffic pattern and pulled up beside the barrier which separated the vehicular traffic from the pedestrian walkway. The gate in the barrier slid open at the same time the cab door did, and Turnbull stepped inside and sat down. He dialed his own number, dropped in the indicated number of coins, and then relaxed as the cab pulled out and sped down the freeway towards Manhattan. He'd been back on Earth now for three days, and the problem of Scholar James Duckworth was still bothering him. He hadn't known anything about it until he'd arrived at his apartment after a year's absence. * * * * * The apartment door sighed a little as Dave Turnbull broke the electronic seal with the double key. Half the key had been in his possession for a year, jealousy guarded against loss during all the time he had been on Lobon; the other half had been kept by the manager of the Excelsior Apartments. As the door opened, Turnbull noticed the faint musty odor that told of long-unused and poorly circulated air. The conditioners had been turned down to low power for a year now. He went inside and allowed the door to close silently behind him. The apartment was just the same--the broad expanse of pale blue rug, the matching furniture, including the long, comfortable couch and the fat overstuffed chair--all just as he'd left them. He ran a finger experimentally over the top of the table near the door. There was a faint patina of dust covering the glossy surface, but it was very faint, indeed. He grinned to himself. In spite of the excitement of the explorations on Lobon, it was great to be home again.