Considered by many to be the worst album of their career, "Abandon" is the second album of Mk VII (how many are there?!) released in 1998, produced by Deep Purple and Roger Glover. It is not only considered the worst Deep Purple album, it actually is from a sales perspective: indeed, it is the "lowest-selling" record in their entire career.
Definitely worth mentioning is "Any Fule Kno That", a track that would often be performed live, "Don't Make Me Happy", a powerful slow blues, featuring Gillan's poignant vocals, "'69", which presents granite riffs by Morse perfectly fitted into Paice's fast rhythms; this album also includes the remake of "Bloodsucker", under the name "Bludsucker", structurally almost identical to the original, except for Morse's stylistic variations. I would recommend listening to (or watching) the version of "69" from "Live in Montreux Jazz Festival" from 2000.
However, a couple of considerations must be made: the band does not really worry much about creatively expressing themselves in new tracks, it is precisely in this period that the Deep Purple phenomenon re-emerges through incredible live performances, which attract more and more fans and consolidate the love of the "veterans".