Michael Crew was the childhood friend of Dominic Swain who was struck by lightning, creating a Lichtenberg figure pattern on his body.
In 1996, a book titled The Boneturner's Tale, apparently from the library of Jurgen Leitner, appeared in Chiswick Library. It was returned, along with four other books, by a man named Michael Crew.
From late 1997 to early 1998, Michael Crew frequented Lions Street Books, and eventually bought Ex Altiora, using it in a ritual to protect himself from a creature that was pursuing him.
In 2005, he walks by Stephen and Grant Walker's house, watching their attempts to enter through a window via a ladder.
In 2006 he encounters Stephen and Grant again, on top of the Tour Montparnasse, where Grant disappears along with Crew.
In late 2012, the Jurgen Leitner-owned book Ex Altiora later showed Swain a Lichtenberg figure, setting him at ill at ease.