From The Legend of Biel

The story of a Probe team from earth on a voyage through spacetime in search of intelligent life.
They find a hauntingly beautiful planet, MC6, capable of supporting human life. But the planet does not surrender its secrets. Fighting time, the team desperately explores clusters of strange geometric structures scattered around MC6, slowly discovering traces of an advanced civilization.
Then the head of the Probe teams finds a key, turns it and is sucked screaming into a black hole where he encounters an intelligence radically different from any other encountered before or since.