Pools of Darkness — James M. Ward; Anne K. Brown

The entire city of Phlan has vanished, ripped from the surface of Toril by dire creatures and magical forces. While the minions of the evil god Bane bicker over the spoils, the brave citizens of Phlan mount a stubborn defense.

A ranger-thief named Ren seeks his missing friends, Shal and Tarl, spellcasters nonpareil. Ren must band together with a mysterious sorceress, Evaine, and her intrepid shapeshifter cat, as well as a couple of droll druids and a fearful knight who is absolutely, positively dead.
Pools of Darkness, based on the computer game of the same name, revisits the heroes of Phlan ten years after the city was saved in the best-selling novel and computer game Pool of Radiance.