1997年，乐团发行了第三张专辑《Whoracle》。专辑同样在“Studio Fredman”录制并与 Fredrik Nordström 共同担任制作人。专辑录制完成之后，Glenn Ljungström 和 Johan Larsson 意外地宣布他们要离开乐团。为了接下来与雾都魔堡乐团的巡回演唱，他们邀请 Niklas Engelin（吉他）和 Peter Iwers（贝斯）填补之前团员离开的空缺。在表演结束之后，Niklas Engelin 和 Peter Iwers 正式加入乐团。乐团以新阵容开始了欧洲巡回，并首次前往日本举行两场演唱会。然而在1998年巡回结束后，Niklas Engelin 离开了乐团。

by Vincent Jeffries

A master of progressive death metal or the "Gothenberg sound" practiced by many a Swedish band, In Flames delivers one of its best efforts with 1997's Whoracle. One extremely heavy number after another flows continuously from this record's track list, including standouts like the mind-bending "Gyroscope" and "Morphing Into Primal," just two of the original and extremely well-executed songs offered on this release. Indeed, some tracks are much better than others on Whoracle. Softer numbers like "Jester Script Transfigured," with its half-acoustic Metallica ballad vibe, could probably have been left off this otherwise powerful recording. There are also some rather unnecessary vocal histrionics, most notably on "Worlds Within the Margin," but this kind of overcooked "singing" really comes with the death metal territory. None of these sour notes manages to damage Whoracle, and the record has ultimately become accepted in the highly factional underground metal community as an important release not only for In Flames, but for the entire melodic death metal movement.