GL goes undercover in prison to save a woman's life! When the super-villain Undertow dies during an escape attempt at the Slab, the circumstances put his ex-wife in grave jeopardy. Now Kyle must pose as an inmate in the Slab to learn her current whereabouts from Undertow's old cellmate, Shakedown. Can he gain the trust of the cutthroat inmate in time to save the ex-Mrs. Undertow's life? And what's the real story behind Undertow's demise??