B is for Burglar, from Sue Grafton's #1 New York Times bestselling Kinsey Millhone Alphabet mystery series

Although business has been slow lately for P.I. Kinsey Millhone, she's reluctant to take on the case of locating Beverly Danziger's sister Elaine Boldt. It's a small matter that Beverly should be able to handle herself. So why is she enlisting Kinsey's services? Beverly claims she needs Elaine's signature on some documents so that she can collect a small inheritance. But the whole affair doesn't sit well with Kinsey. And if there's something she's learned in her line of work, it's to always follow your instincts...

Kinsey's hunch proves true when she begins her inquiries into Elaine's whereabouts and discovers that the attractive widow was last seen in a flashy lynx coat boarding a plane for Boca Raton. But the more Kinsey searches for Elaine the more questions she encounters. Is Elaine's disappearance tied in to the brutal murder several months ago of one of her bridge partners? And what happened to Elaine's Persian cat who seems to have also vanished?

Things take a turn for the worse when a stranger vandalizes the home of one of Elaine's neighbors and another neighbor turns up murdered. With her reputation and career on the line, Kinsey risks all to find a missing woman and a killer who's waiting in the shadows to strike again...

A Is for Alibi
B Is for Burglar
C Is for Corpse
D Is for Deadbeat
E Is for Evidence
F Is for Fugitive
G Is for Gumshoe
H Is for Homicide
I Is for Innocent
J Is for Judgment
K Is for Killer
L is for Lawless
M Is for Malice
N Is for Noose
O Is for Outlaw
P Is for Peril
Q Is for Quarry
R Is for Ricochet
S Is for Silence
T Is for Trespass
U Is for Undertow
V Is for Vengeance
W Is for Wasted
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U is for Undertow (Kinsey Millhone, 21)