Thanks to the wonders of television, even the most complex murder investigations can see justice served within the hour. But the twisty whodunit at the center of ABC’s “Secrets and Lies” was granted a 10-episode berth to weed through a cul-de-sac of suspects in search of the answer to the million-dollar question: Who killed sweet, innocent Tom Murphy?The investigation concludes today in the season finale that will reveal the killer and hopefully convince Ben (Ryan [...]