Northamptonshire 74 for 0 (Vasconcelos 43*, Procter 28*) trail Kent 345 (Crawley 89, Bell-Drummond 70, Compton 53) by 271 runs
Kent captain Daniel Bell-Drummond passed 10,000 first-class career runs with a vital knock of 70 to counter Northamptonshire's spirited fightback with the ball in their Rothesay County Championship Division Two promotion clash.
The second-placed visitors, with a four-point advantage over Northamptonshire at the start of the game, slumped to 256 for 8 after Zak Crawley and Ben Compton's opening stand of 162.
Seamers Ben Sanderson, Liam Guthrie and Luke Procter picked up two wickets apiece, as did spinner Yuzvendra Chahal, but Bell-Drummond's ninth-wicket partnership of 80 with Matt Milnes enabled Kent to recover to 345.
Procter and opening partner Ricardo Vasconcelos trimmed 74 off the deficit before bad light and rain at Wantage Road brought play to a premature close.
Having gone wicketless the previous evening, Northamptonshire's bowlers transformed their fortunes during the opening hour as the Kent top four succumbed for the addition of 34 to their overnight total.
Crawley's quest for a first hundred since England's Test against Zimbabwe 15 months ago continued as Sanderson trapped him in front for 89 and Compton soon followed in similar fashion to one from Guthrie that stayed low.
Tawanda Muyeye began with successive boundaries off the left-armer, only to pull a short ball off his hip and pick out the man at long leg before Sam Northeast walked into a straight one from Sanderson.
Although the opening bowlers were given a well-earned rest, it was left to skipper Bell-Drummond to hold Kent's innings together as an excellent leg-side diving catch by Lewis McManus removed Chris Benjamin.
Operating in tandem in the run-up to lunch, leg-spin duo Chahal and Calvin Harrison claimed a further three wickets between them including that of Ekansh Singh, who lifted successive Chahal deliveries for four and six before pulling the next to midwicket.
However, Bell-Drummond found reliable support in the shape of Milnes, who pulled Harrison off the back foot for four and cut the spinner to the fence again to pocket the visitors' second batting bonus point.
Sanderson and Guthrie returned to share the new ball, but Bell-Drummond immediately dispatched it off his pads for a boundary to take him past 50 for only the third time in this season's Championship.
It was his opposite number Procter who achieved the breakthrough, removing Milnes leg before for 37 and then wrapping up the innings short of 350 as Bell-Drummond gave him the charge and edged behind.
That left Northamptonshire five overs to negotiate prior to tea and Procter and Vasconcelos did just that with the minimum of fuss, the captain initially - and unusually - outscoring his partner.
Vasconcelos forged ahead in the final session, taking on Matt Parkinson with some sweetly-struck, productive drives over the top and pulling Grant Stewart to the rope as the overhead conditions deteriorated.
Umpires Paul Pollard and Hassan Adnan conferred midway through Stewart's next over and opted to halt proceedings for the day, with Vasconcelos on 43 and Procter 28.
