Morgue Drawer Four (2014) by Jutta Profijt.

A rollicking krimi with a pair of mismatched buddies, one an extroverted sleek lowlife car-thief with a four letter-word vocabulary and the other an introverted roly-poly PhD scientist in Cologne Germany.
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Pascha is a rev head who loves cars, and stealing them is great fun, the more so getting paid to do so. Then one night after stealing a particularly desirable rocket car, on order from the Russian mafia, he finds in it…. Something he should not have.
He pays for his discovery and that brings him into contact with Martin, the super nerd. Their efforts to communicate and, reluctantly, to cooperate are a hoot. One is street wise to the Nth degree and the other equally book wise.
With false starts, snits, and pouts they slowly combine to find a killer, and find both more and less than they bargained for. Along the way they come to respect the assets each brings to the mission. The setting of Cologne, that cathedral city in Germany, offers much to’ing and fro’ing around town. There is some travelogue as each shows the other his haunts.
It is hard to say more without a very large spoiler.
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This is the first in a series and I hope the author can keep up the joie de vie.