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Isaac Dan der Grimnebulin is a human scientist, and one of the main characters in Perdido Street Station. He was formerly a professor at New Crobuzon University under Vermishank, but left after deciding that he was not a good fit for teaching. He is described as "brilliant" and "undisciplined."



Isaac works freelance assignments for the university in order to access its laboratories, as well as to be able to purloin scientific equipment whenever possible. Isaac also makes a living by selling his services to people in need of his advanced scientific abilities.


Isaac has his own laboratory in Brock Marsh, where he shares a space with fellow scientists David Serachin and Lublamai Dadscatt. He often will fiercely study new topics that catch his curiosity, such as how the khepri's compound vision works, or how vodyanoi watercraeft works, before losing interest and moving onto new things.

Isaac's current passion is for Unified Field Theory, specifically attempting to tap Crisis Energy in an attempt to restore flight to his client, the de-winged Garuda Yagharek.


Isaac is romantically involved with Lin, a khepri artist, but keeps their relationship secret from his professional associates. He was a lover of Bellis Coldwine a major character in The Scar some years before the events of Perdido Street Station.

Events of Perdido Street Station[]

Characters in Perdido Street Station
Main characters

Isaac Dan der Grimnebulin · Lin · Yagharek · Derkhan Blueday · Motley · Mayor Bentham Rudgutter

Minor characters

Andrej Shelbornek · Benjamin Flex · Cornfed Daihat · Construct Council · David Serachin · Lemuel Pigeon · Lublamai Dadscatt · Magesta Barbile · Montjohn Rescue · Montague Vermishank · Pengefinchess · Shadrach · Silchristchek · Tansell · Eliza Stem-Fulcher · Teafortwo