Reubel flat refuses.
"We did your damnfool tests," he snaps, slamming the dishwasher closed and poking viciously at the cycle buttons. "The poor kid's not undead, he's just not dead, so find a new hobby. And leave me out of it."
Grace (who has never in her life been deterred by good advice) and Mu (who is congenitally immune to peer pressure) look at each other, shrug, and head off to hack the school database without Reubel.
Bright and early Saturday morning, Grace and Mu show up at Matt's house and announce that they're hosting a surprise hooray-you're-not-dead party for Theo, all his friends are invited, wouldn't you like to come? There'll be cake! Matt acquiesces and heads with them to the (empty) gazebo at the (deserted) park ("mom'll kill us if we have a party at our place, even if we swear we'll clean it up, moms, am I right?") where he is promptly tackled and gagged and tied up and dumped on the grass on a picnic blanket.
"Sorry 'bout all this," Grace tells Matt, patting him on the head, while Mu starts in on the fake blood. "It's in a good cause. Awesome prank and stuff. And I'll get you cake for real when we're done."
Slightly less bright and early, Theo's home phone starts ringing with a call from an unlisted number.