Rejoice! Reeve returns to the vivid, violent, steampunky world of his Hungry Cities Chronicles. In a still-stationary London, signs of the genocide that killed the mutant Scriven overlords are fading. Teenage Fever Crumb, orphaned in the Skinners’ Riots and the only female raised by the eminently rational Order of Engineers, is recruited by an archaeologist who has found a hidden Scriven workshop. But nomads are moving in, Fever is beset by unfamiliar memories and civil unrest is once again taking over. Filled with humor (“blog,” as in who gives a, is a swearword) and tackling issues of love, family and power, the author balances the occasional cheap laugh (the Hari Potter cult) or violent death with a finely wrought coming-of-age story starring an unlikely and occasionally unlikable heroine who (like Hester Shaw) becomes a figure of pathos and dignity. Bonuses: the start of Municipal Darwinism, Grike’s origins and a glimpse of the real Great Quirke. An essential read for fans and a great entry point for newcomers to the world; here’s hoping there’s more to come. (Science fiction. 13 & up)