There was almost a sting in the tail as Quins Ladies defended a four point lead deep into injury time.
Wasps pounded the try line but could not breach Harlequins heroic defence, in fact it was a Jess Breach tackle that dislodged the ball as Wasps were about to dot down for a match winning try.
The match was a tough physical battle made all the more attritional by the free for all that was allowed at the breakdown, and also by the tackling of the French Exocet Khadidji Camara who made so many big hits in midfield that the photo frames in club house were rattling on their hooks.
She was justifiably named player of the match.
Quins were pruned of their Red Roses the exception of Jess Breach and Emily Scott, and it was Jess the Chichester Express that scored a long range intercept try in the 26th minute that gave Quins a 10-5 lead before Abbie Dow scored a try for Wasps with two minutes of the first half remaining to draw the scores level at 10-10 at half time.
A 60 minute penalty gave Wasps a 13-10 lead after which Quins pounded the Wasps line with a series of scrums that resulted in sevens penalties for the visitors and despite a yellow card for Wasps, a penalty try was not awarded.
The wallaby warrior Chloe Butler took matters into her own hands and stormed over for a try on 77 minutes converted by Ellie Green.
With a 17-13 lead Quins defended with their lives for the remaining few minutes.
As they replaced all the photo frames in the club house Quins reflected on a hard fought win that brings a home semi final within touching distance.