A Jar of Hearts — Clarissa Cartharn

Book 2 of the JAR SERIES

James Connelly has a deal with the FBI. Two years of his life in exchange for freedom for the rest. There are two conditions though. The first is to infiltrate the deadliest gang in San Diego, The Pachecos. The second is to never contact Anne Mullen. Well, that's gonna be damn hard when she's just bought a house two doors down from his own.
Now, he has to make sure that they're both not dead before his mission's over.
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Each book in this series can be read as a standalone.