Although the 3rd in the Eon/Eternity trilogy, this is in effect a prequel to the other 2. The enigmatic fixer, Olmy endures decades of exile on an exotic planet with a mission to investigate an illegal colonisation. The real star of the book however is the planet Lamarckia, which is visualised with endless originality and invention. The processes of life on Lamarckia are grandiose and incomprehensible; the colonists struggle with war and starvation amid luxuriant growth. Although much will remain mysterious about the biology of the planet and its concealed sentiences, we are party to myriad wonders along Olmy's travels. The human drama is absorbing and tragic, and, as is usual with Greg Bear, handled as competently as by anyone in the literary mainsteam. (Hard SF this may be but it doesn't fetishize technology or descend into physics seminar.) My personal favourite SF book.