Now and Then by Robert B. Parker

When a simple case turns into a treacherous and politically charged investigation, Spenser faces his most difficult challenge yet-keeping his cool while his beloved Susan Silverman is in danger. Spenser knows something's amiss the moment Dennis Doherty walks into his office. The guy's aggressive yet wary, in the way men frightened for their marriages always are. So when Doherty asks Spenser to investigate his wife Jordan's abnormal behavior, Spenser agrees. A job's a job, after all.

Spenser is back and embroiled in a deceptively dangerous and multi-layered case: someone has been killing racehorses at stables across the south, and the Boston P.I. travels to Georgia to protect the two-year old destined to become the next Secretariat. When Spenser is approached by Walter Clive, president of the Three Fillies Stables, to find out who is threatening his horse Hugger Mugger, he can hardly say no: he's been doing pro bono work for so long his cupboards are just about bare. Disregarding the resentment of the local Georgia law enforcement, Spenser takes the case.

Bad Business by Robert B. Parker

A cheating husband and a wayward wife provide Spenser with an unconventional and dangerous surveillance job. When Marlene Cowley hires Spenser to see if her husband, Trent, is cheating on her, he encounters more than he bargained for: Not only does he find a two-timing husband, but a second investigator as well, hired by the husband to look after his wife. As a result of their joint efforts, Spenser soon finds himself investigating both individual depravity and corporate corruption.

Back Story by Robert B. Parker

In 1974, a revolutionary group calling itself The Dread Scott Brigade held up the Old Shawnut Bank in Boston's Audubon Circle. Money was stolen. And a woman named Emily Gordon, a visitor in town cashing traveller's cheques, was shot and killed. No one saw who shot her. Despite security camera photos and a letter from the group claiming responsibility, the perpetrators have remained at large for nearly three decades. Enter Paul Giacomin, the closest thing Spenser has to a son.

Hush Money by Robert B. Parker

Spenser is asked to investigate when Robinson Nevins is denied tenure at the University, apparently due to a rumoured affair between Nevins and a young gay activist. The case turns deadly, and Spenser uncovers a conspiracy to keep America white, male and straight.