Beset by nightmares after her recent adventure into Egypt, Lara determines to trace the secret behind the recurring cat motif she sees nearly every night. Rumours have reached her that Khamoon (a buried city she only recently discovered) has become flooded due to a natural disaster and she believes the nightmares may be some unconscious desire to see whether the floodwaters have uncovered any further mysteries...

Lara also finds herself battling against the mysterious Atlanteans once again - is this another dream, or is there more at stake than just lost sleep?