The Promise by Robert Crais
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Loyalty, commitment, and the fight for justice have always driven Elvis Cole and Joe Pike. If they make a promise, they keep it. Even if it could get them killed. When Elvis Cole is secretly hired to find a grief-stricken mother, his first stop is an ordinary house on a rainy night in Echo Park. Only the house is not ordinary, and neither are the people hiding inside: a wanted fugitive on the run from police, and a vicious career criminal with dangerous secrets of his own.