Sethle works as an undertaker in the Graveyard area of Athkatla. He helps Am-Si and his fellow kidnappers get rid of their victims by allowing them to bury the kidnapped in the newly unearthed graves for a nice amount of money.
Sethle can be confronted by Gorion's Ward after the latter has met Tirdir. At this point the undertaker will direct the party to the Docks district. His ultimate faith is then for the party to decide: they may kill him or spare his life but make him leave the city for good under threat of telling him on the authorities.