Murder on the Airship Arcadia, livre audio

Detective Sergeant Ignatius Brown was on holiday. His leg not yet recovered from his last brush with death. Still plagued by 'night terrors', he was glad of the opportunity to get out of London and join his two cousins on the airship for a quiet cruise. All is not as it seems when a notorious gunrunner is murdered.
Ignatius must uncover the killer before he strikes again.