Mercedes Lackey, Roberta Gellis, . . Baen, $25 (496pp) ISBN 978-0-7434-7156-5

In this exciting historical fantasy from veterans Lackey (Exile's Valor ) and Gellis (Bull God ), Rhoslyn and Pasgen Silverhair, elven twins kidnapped by Vidal Dhu and raised as Unseleighe Sidhe, receive alternative visions of the future. In one, a red-headed child born to Henry VIII ascends to the throne after the king's death, leading Britain into a prosperous and joyous future. In the other, another child rules, and with her coronation opens Britain to the fires of the Inquisition. Unbeknownst to Rhoslyn and Pasgen, however, the same double vision comes to their half-siblings among the Bright Court elves, Denoriel and Aleneil. Thus inspired, the two sets of twins set out to force the future they each desire. Denoriel attaches himself to Henry FitzRoy, the bastard son of Henry VIII, who may be the key to ensuring the red-headed child's rule, while Rhoslyn assumes a place in Princess Mary's household. FitzRoy, who grows from a sweet, innocent child into a sweet, innocent young adult, and Denoriel, who goes from reluctant nursemaid to dedicated almost father, get most of the attention, but it's the dark twins who provide the most interest. The mental, magical and eventually physical battle between the two sets of twins speeds the entertaining plot along, and knowledgeable readers—hey, that Anne Boleyn is going to lose her head—will enjoy the interplay between elven intervention and historical fact. (Feb. 1)