There are hardly any excesses of the most crazed psychopath that cannot easily be duplicated by a normal kindly family man who just comes in to work every day and has a job to do.
—(Terry Pratchett, Small Gods)
The BRS Gwynith is an air ship of the Byrlothian Resistance. She is sentient, needing no crew to fly or man her, though she generally has a crew aboard for doing repairs and to go where she cannot.
A young man, disowned by his family, traveling the world in an attempt to redeem himself with his musical talent and his prowess with a sword.
A secret MLM (pyramid) company that offers eternal life, but in fact it transfers the life forces of its members to those position "above". If you get high enough, (meaning you get enough new members) you start to enjoy the benefits. Maybe a willing sacrifice is much more effective for the transfer. But no one says, that a suddenly unwilling member, threatening to tell the authorities, may not loose it involuntarily... thus start people to vanish, and aged corpses are deposited somewhere safe.