Into the Alternate Universe / Contraband from Otherspace (Saga of Commodore John Grimes, Vol. 4)

"Commodore John Grimes of the Rim Worlds Naval Reserve is the practical, hard-headed hero of galactic battles - not the sort of man you'd expect to find chasing after ghosts. But when Commander Sonya Verrill proposes a ghost-hunting expedition on the Galactic Rim, Grimes steps into the alternate universe"--Back cover