Two short novels by a couple who've each gone it alone very successfully in their previous literary efforts make for a double treat for fans of both authors--Faye, whose mysteries feature a similarly uxorious couple in Rina and Peter Decker, and Jonathan, whose Alex Delaware novels starring a thoughtful child psychologist who's luckier in crime-busting than in love are even more popular. Not as satisfying as each author's full-length efforts, Double Homicide nonetheless offers a tasty side dish for their fans, and their protagonists venturebeyond Los Angeles to tread new geographical territory, too. In Boston, a popular college athlete is slain in a busy nightclub, but what seems like an open-and-shut case turns out to hinge on forensic evidence that points to a very different conclusion. Detectives Michael McCain and Doris Breton unravel the mystery in Beantown, while two other new characters, Darryl Two Moons and his partner Steve Katz, discover that gallery owner Larry Olafson's brutal slaying has repercussions that resonate far beyond Santa Fe's trendy Canyon Road. Neither of these novellas makes the most of either author's gifts at character development, which lend themselves to a longer format, but that won't stop their dedicated readers from snapping them up and savoring them until the Deckers or Dr. Delaware turn up in their next adventures. --Jane Adams