Charles Helliwell's Answer:
Oh dear...an employee who bends the rules; but then this is hardly a hanging offence is it ?
Your coaching objective is on performance improvement. That's great, because every coaching and mentoring intervention should have some kind of performance improvement metric attached to it; so at least that's a positive step in the right direction.
Now let's take the emotion and invective out and assess what's going on here. Is this individual really lying to you? I suspect not.
He may well want to take ownership of something, however, the work he's currently engaged in probably isn't it. Consequently, it's going to be nigh on impossible to coach him to value his work, if he doesn't enjoy it or find it stimulating.
His hiding away to read a book for an hour strikes me as the behaviour of someone who doesn't want to do the work that's been assigned to them. This is a classic behaviour of avoidance, so coaching them to fulfill this role is frankly a waste or your time and his.
It's time for you to have a grown-up, joined-up conversation about what this individual actually wants to do in your organisation. Then and only then are you and he going to be better placed to make some positive choices to suit you both.