Mageworlds, book 2: Starpilot's Grave
Debra Doyle et James D. Macdonald1993

A broken and drifting ship, its long-dead captain still strapped in the command seal: that's what free-spacers call a starpilot's grave. When one of these derelict craft appears in the Net, the artificial barrier zone separating the Republic from the Mageworlds, the discovery is no accident. It's a sign, a warning that the Mageworlds have not forgotten the Republic - and the Magelords make long plans.

Titre original : Mageworlds, book 2: Starpilot's Grave (1993)