Northampton Saints are 4/9 favourites to win a second Premiership title after conquering Saracens 22-20 in a pulsating semi-final at Franklin's Gardens.
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Table-toppers Northampton were made to sweat in the closing stages but they held on valiantly to thwart Saracens and book their place in the final at Twickenham.
It was the visitors who made an assertive start to proceedings but the Saints soon began to demonstrate the form that saw them finish at the summit and they were ahead at half-time courtesy of Burger Odendaal's try.
Penalties from Fin Smith put further daylight between themselves and their opponents but Sarries hit back, with the departing Owen Farrell conjuring a moment of magic to allow Alex Lewington to score.
Lucio Conti's 79th minute try reduced the deficit to two but Northampton held on, with their quest for a first Premiership title since 2014 approaching the last hurdle.
They will now face Bath, who are set to compete in their first final since 2015 after overcoming Sale Sharks 31-23 in a gripping battle.
It's a remarkable turnaround for the Somerset club, who finished bottom of the league two seasons ago.
Bath fly-half Finn Russell was pivotal to their success as the Scotland star kicked 16 points, but it was replacement Niall Annett who was the hero as his late maul score kept Bath on track for Premiership glory.
It is 28 years since they were crowned champions of England and Bath will fancy their chances against a Northampton side they have shared some pretty tight encounters with in recent months.