Timothy Stoker is an archival assistant at The Magnus Institute, London. He helps Jonathan Sims with the archived statements by looking into the details of various cases. He may have used Institute funds to woo a medical professional in the past (MAG 3).
He looks into Amy Patel's medical conditions, finding that she suffered no long-term consequences from her concussion (MAG 3).
Tim researches the facts of the statement of the supposed Antonio Blake, discovering that "Antonio Blake" was a fake name, as were all the contact details he had given (MAG 11).
He tries to find Lee Rentoul, who had supposedly disappeared in early April 2011. Tim discovers that Rentoul's landlord, when clearing the flat that Lee had once occupied, found it empty except for hundreds of cardboard boxes, presumably containing Rentoul's body parts (MAG 14).
Tim obtains a copy of the video recording Laura Popham made during her descent into Lost John's Cave. He also contacts the CNCC for more details on this case (MAG 15).
He contacts several butchers in Wandsworth to see who had been giving Toby Carlisle the meat that had coated the inside of his apartment but was able to find no information on the matter, so where, and how, Carlisle had acquired it remains a mystery (MAG 18).
Tim looks into happenings in Doncaster after Robert Kelly's disappearance and talks to Joseph Tuse about a parachute bag that landed in his field (MAG 21).
He is reminded of traveling circuses in Europe when looking into the case of the red calliope owned by Nikolai Denikin, and later by his granddaughter Leanne (MAG 24).
Tim is out for lunch during Jane Prentiss's siege on the Institute and is absent when the others barricade themselves inside the safe room (MAG 39). He is rescued by Sasha James and attempts to escape alongside Jonathan Sims and Martin Blackwood, but becomes separated from the latter. He and Sims are both attacked by Prentiss, but are saved by the deployment of the CO2 system (MAG 40).
The two of them are given leave following the attack (MAG 41) and takes Sims' subsequent paranoia the worst of the researchers. He, along with the others, confronts Sims over his increasingly erratic behaviour (MAG 60), but relations between Tim and Jonathan do not improve following the intervention. This comes to a head in an argument during which Tim demands sympathy, having faced the same hardships as the rest of them, but Sims tells him that he is still unable to trust him. When Tim attempts to quit, he realises that he and the others are somehow being compelled to stay at the Archives (MAG 65).