This is a spin-off from Ms Taylor's St Mary's books, featuring Max, Leon, Markham, and a whole cast of wacky historians, where the Time Police are often cast in the role of heavy-handed, jack-booted villains. This time we get to see them as individuals as Max and Leon's son, Matthew reaches the age where he can (and does) choose to enrol as a trainee in the TP, along with two friends, Jane, who has nowhere else to go, and Luke who is sent by his very rich father to teach him a lesson. Like his mother, Matthew tends to have his own ideas about things, which gets him into trouble (of course). If only he can get through (i.e. survive) basic training he's destined to work with the Time Map, but first he has to survive, and it's a real possibility that he won't. Matthew's a bit of an oddity and he doesn't make friends easily, though he's brilliant at making enemies. Things are changing in the Time Police, but there are still a few hard-heads who long for the old days of jump-in, shoot first, don't ask questions either now or later, and jump out again.