VIDEO: George North a familiar obstacle for Ospreys' shooting star Eli Walker
THE book of Eli already contains some memorable chapters on the Heineken Cup, and Sunday at Franklin's Gardens may just offer the best material yet.
Eli Walker will be on the same pitch as George North in a Northampton v Ospreys clash that neither side can afford to lose.
Whether they are in direct opposition or not, the game will provide a fascinating contrast between two wings who faced each other many times in age-grade rugby, one a bludgeon, the other a rapier.
BELOW: Head coach Steve Tandy looks ahead to the game against Northampton:
North's quality isn't in doubt after his try-scoring, opposition-carrying, eye-catching displays for the Lions in the summer.
But what a chance it is for Walker to use European rugby's premier competition to do a bit of self-promotion himself.
Ten months ago Toulouse found the sprinter too hot to handle. He made four clean breaks against them and scored a try in a superb exhibition of wing play. He touched the ball more than 20 times, more often than not terrifying one of Europe's premier teams every time he did so.
And Leicester had roughly the same treatment a month later, with Walker repeatedly leaving defenders in his vapour stream. Not long after Rob Howley called him the most in-form wing in the United Kingdom.
Walker's equilibrium wouldn't have been disturbed by the remark.
He is mature beyond his years, a cool cat who gives the impression of being able to take praise and criticism in his stride.
But how is he looking forward to renewing acquaintances with North?
"It would be good to play against him," he said.
"I've been playing with him since we were 14 or 15. We played under-16 rugby together and I can remember him playing for the Scarlets and me for the Ospreys at Llandarcy.
"We know each other's games inside out. George is definitely one of the best wings in the world.
"He had a great campaign with the Lions in Australia and has maintained his form with Northampton.
"Even though he's a powerhouse, he's also a speedy wing but I like to think I bring something else, maybe a step or a bit of finesse."
Walker was pressed on whether he was faster than North. "I can't really comment because we haven't done any actual testing but I'm confident — I would back myself against any wing on the park," he replied.
There is authentic respect there, though, not just for North but for Ben Foden and Ken Pisi, who make up the back three at Franklin's Gardens.
"We know how good their back three are," said Walker.
"We've watched footage and realise we don't want to be kicking aimless balls to them. Whenever we're in possession, we have to keep it, otherwise they'll punish us.
"Their style is slightly different. We like to get our wings involved right across the pitch, but most Premiership wingers stay out wide.
"George is different. It's more natural for him to come infield looking for the ball because he's used to playing in the RaboDirect."
The challenge for the Ospreys will be to provide Walker with the platform he needs to do damage.
They failed to do that against Leinster, with the passing below par and the ex-Swansea man rarely having chances to run at opponents in space.
He ended up as a gun that stayed in its holster, unable to hurt Leinster because he didn't have the opportunities to do so.
"It's been difficult for the backs across the board in the last couple of games because we've not had much phase play and so haven't been able to build our game," said Walker.
"But we have to stay positive and capitalise on chances when they come.
"I like to get my hands on the ball, whether it's near my try-line or the opposition's line.
"I just want to get my hands on the ball and attack.
"Our backs coach Gruff Rees has told me: 'Keep you work-rate up and, like a football striker, chances will come'."
Walker will doubtless be looking to impress Warren Gatland in Northampton.
He made Wales's squad for the Six Nations last term, only to hit injury problems that prevented him from challenging for a cap.
He isn't the type to start shouting from the nearest rooftop that he is going to oust North or Alex Cuthbert this term, but he does enjoy competition.
"It spurs you on, not just in games but in training, seeing the form some of the Welsh wingers have been in, especially with the autumn internationals around the corner," he said.
"Everyone is fighting for a spot and it's great to see all the guys doing well. You do an extra ten or 15 minutes extra at the end of training because of the competition. It brings out the best in you.
"But I can't think of Wales at this point. My intention is to play well for the Ospreys and, hopefully, something will come for me this autumn."
Sunday would be a good time to remind Gatland, and everyone else, exactly how good he is.