Inquisitor Jaq Draco and entourage
The book is revealed
@scribbs has correctly identified the models.
My interpretation of the characters from my favourite 40K books, The Inquisition War by Ian Watson. A fantastic book written by an already established author that is proper grim, quite adult and goes off piste from core lore, so sadly rarely sees a reprint.
This group represents the characters from the first book “Draco”.
Inquisitor Jaq Draco. The base model is the Primaris Judicar from the Indomitus box, I really like this model and as a bonus the armour is not immediately obvious as Space Marine. I replaced his sword with a Power Axe ( this did require some careful trimming as the sword hilt sculpted to the forearm and in the bend of the arm), and the giant egg timer was replaced with a combi bolter/flamer. I was going to use a bald space marine head and sculpt on a beard, but when looking through the Orlock trike sprue and found this head, all I had to do get head to fit was to add neck and ball joint from the original Judicar kit, and trim the underside of the beard.
I did not want to use a space marine backpack as it is too distinctive, as luck would have it the Orlock sprue has a couple of back packs that fit over the protruding connector on his back perfectly with no trimming.
I am not sure about the gun, is it to big? I still am waiting for some bits for final details along with some greenstuffing to do
Meh' Lindi, Jaq's Callidus Assassin/Consort. I have never liked the stupid hair, so that had to go, but to maintain the sense of movement, I pinched a sash from a Harlequin, I also trimmed off the belt in preparation for a green stuff sash around her waist, still to do. 
I also removed the giant rock/pillar from under her foot as I wanted her at ground level.
Vitali Googal, the Navigator, just a head swap (still waiting for the head), I may swap the hand with the cane for a hand with a shuriken or laser pistol.
Grimm the squat, even though in my re-read of the book so far, there is only one scene in first couple of paragraphs (maybe there will be more later on) but it was an image that was in my head when sourcing models. The Vottan sprue arrived on Friday and I built the core of the bike up.
The grav/wheel support (centre of picture) was attached but I was left with a void, which had on original model another half to attach, I was debating whether I needed to fill this prior to attaching wheel's, when inspiration struck.
So I trimmed down the top of the grav plate to produce this
And as luck would have it when the Orlock Quad sprue arrived the following day, the wheels fitted perfectly.
To get the smaller wheel to fit I trimmed and sanded between the forks and glued the wheel in as far as it would go, but the hubs of the wheel were still uncovered
I’ll admit to having a bit of a helping hand from recently re-reading the old Deathwing anthology of 40k stories, which includes a short story on Meh’lindi prior to her joining Jaq, and another one featuring Grimm (and reference to his beloved battle trike). Thus both characters were primed for recognition.
Sadly not read Draco yet, so I didn’t stand a chance. My stupid brain kept saying Ravenor, but I knew for certain I was wrong.
You must read Draco it was written quite a while ago, one of the first 40k books so it does break cannon a bit, but in my opinion it is still one of the best books they have done.