Born in Death (In Death Series #23) by Robb, J. D. [Nora Roberts] - 2007

23rd in the 'In Death' series featuring Lieutenant Eve Dallas.
"Just as Eve Dallas begins to investigate the grisly double homicide of two young lovers - both employees of the same prestigious accounting firm - her friend Mavis needs a favor. One of the moms-to-be in Mavis's birthing class has gone missing. Normally, such a case would be turned over to Missing Persons. But Mavis wants no one else on the job but Eve - and Eve can't say no.
"Now Eve's trying to track down the missing woman, while simultaneously unearthing the deals and double-crosses hidden in the files of some of the city's richest and most secretive citizens, in a race against this particularly vicious killer. Luckily, her multimillionaire husband Roarke's expertise comes in handy with the number crunching. But as he mines the crucial data that will break the case wide open, Eve faces an all-too-real danger in the world of flesh and blood. "; 5¾" - 6¾" Tall .