Dixon, Nolan and Hanna conclude the introduction of Lock-Up in Detective 699 (Late July 1996).
Lock-Up brings Tim Drake back to his prison. Tim is still in contact with Nightwing, and informs him that he believes they are on, or near, water. But then Lock-Up tosses him into the delousing tank, and his mike shorts out.
With hoods about to shoot him, Matches Malone (Batman in his underworld identity) fights back in close quarters, causing a car accident, spectacularly illustrated by Nolan and Hanna. Batman manages to crawl out and get away.
Lock-Up takes Tim’s fingerprints, to determine who he is. Some quick thinking, and hacking, by Oracle provides him with a fake identity and rap sheet, so Lock-Up has no idea who his new prisoner really is.
Nightwing keeps searching, eventually finding the prison. He is interested in freeing Tim and getting away, to return with Batman later. But Lock-Up opens the cells, and starts flooding the prison. Nightwing has to deal with Two-Face and Killer Moth, both as interested in vengeance as escape. Two-Face has already figured out that Tim must be Robin, simply because of Nightwing’s interest in him.
Batman shows up just in time, and the flooded villains, Lock-Up included, are taken away.
Lock-Up would return, and for a while actually become a sort of ally.
One other significant thing does happen in the issue. Armand Krol, hanging on to the bitter end of his term, collapses and dies. He had survived the Clench, but it seems to have returned.
This is a set-up for next issue, and the Legacy storyline.