Temporary Family (McKay Sisters #3)
Sally Tyler Hayes

Laura Sandoval loved young, orphaned Rico as if he were her own son. But she knew the boy needed much more than a mother's loving arms. For the once-cheerful child was now refusing to speak, afraid of something--someone--that Laura could not discover.
She knew of only one man to turn to: Nick Garrett. But even as the self-exiled doctor attempted to unlock Rico's hidden fears, danger came calling. And suddenly this makeshift family of three was on the run.
Their only clue existed in the mind of a silent child. Their only chance meant staying together. Their only recourse was to fall in love.