They spend most of the next week in the garden, where the high hedges shield them from prying eyes, or, when it rains, in the living room. Gradually Tom learns how to make himself disappear when he wants, but still sometimes does it involuntarily if he gets scared (Dougie jumps out at him in the morning still, just to see him disappear with shock). He manages to scare the others a few times by sneaking up on them, but between them Danny and Dougie can often work out where he is by following his thoughts and emotional trail or some such rubbish. Tom's pretty sure that it's just lucky guesswork that leads them to him.
Harry waits until it's raining until he takes Tom out to show him his power. Harry refuses to let him have an umbrella, and stands him in the middle of the garden, so they stand side by side looking towards the house. It takes a moment before Tom notices, but the rain has stopped. Except it hasn't, because he can see it around them, and realises that there is a circle around them where rain is no longer falling, and there's a point about a metre above their heads where the rain just seems to vanish; it doesn't hit anything, it just isn't there anymore. Harry is obviously smug at the control he has over his power already, and so Tom tries not to look too impressed.