Thompson, Victoria (Victoria E.). Gaslight mystery.

As 1899 draws to a close, Frank and Sarah Malloy are ready to celebrate the New Year--and century--at Trinity Church when they notice Mr. Pritchard, a neighbor's relative, behaving oddly and annoying the other revelers. When Frank tries to intervene and convince Pritchard to return home with them, he refuses and Frank loses him in the crowd. The next morning Sarah and Frank are horrified to learn Pritchard was murdered sometime in the night, his body left on Trinity Place, mere steps from the incident. The police don't seem very invested in solving the crime, and the family is concerned that the irregular circumstances of the death will reflect badly on Pritchard's reputation. They ask Frank to investigate. To prevent scandal, and catch the killer, Frank and Sarah must search Pritchard's past for a link between the new crimes...and old sins