The Burglar Who Painted Like Mondrian

Description for THE BURGLAR WHO PAINTED LIKE MONDRIAN by Lawrence Block:

Antiquarian book dealer Bernie Rhodenbarr jumps at the chance to appraise wealthy Gordon Onderdonk's private library. Not only will the assignment earn him a little extra cash, it will put him inside one of the most luxurious apartment buildings in the city -- a choice opportunity for this part-time thief. And Bernie can't help but notice the priceless Mondrian hanging on the wall of Onderdonk's posh pad....

So when he must come up with a Mondrian as ransom for his best friend's kidnapped cat, Bernie makes a covert return trip to the apartment, only to discover that the painting is gone -- and finds a body in its place. Now he has to rescue an imperiled feline and uncover the truth about a clever crime, because someone's perfecting the art of murder -- and Bernie's been framed....

This is #5 in Bernie Rhodenbarr series.