Out of the Cold (Robyn Hunter Mysteries)

"Please," I said. It was all I had the chance to say. He looked at me, then at the stairs behind me. He rushed at me and pushed hard, throwing me off balance. I reeled backward, stumbled over, and started to fall. After a homeless man dies during a cold winter night, Robyn and her friends work to uncover who the man was before his time on the streets. They have only two clues to guide them: a class ring and an old photograph that the man left behind. Robyn just wants to honor the homeless man’s memory. But as the search heats up, she begins to suspect that someone’s investigating her too. . . .