Is First Grade Detective Johnny Dillon copping out when his kid sister Chrissy Dillon, out of town for the summer, is the victim of a hit and run accident which is more likely murder and Johnny does not take the law into his own hands? Only for a time, for when an alibi seems likely to exonerate her assailant, Detective Dillon becomes Killer Dillon--a tiger hard to held. Walsh keeps the reader on another two-way stretch--somewhere between sympathy and surprise. Good.