The Summer Guests by Tess Gerritsen (Thomas & Mercer)

Tess Gerritsen’s The Summer Guests is set in Purity, Maine, a seemingly idyllic coastal town hiding a remarkable array of secrets. The story centers on Maggie Bird, a retired CIA agent looking for some peace, only to be swept into local drama when Zoe, the daughter of wealthy “summer people,” suddenly disappears after visiting a nearby farm. As Maggie is reluctantly pulled back into an investigative role, with the help of her former spy friends, the self-proclaimed “Martini Club”, the narrative quickly moves from typical small-town peculiarities to much deeper revelations and a decades-old mystery.

Gerritsen’s narrative approach is brisk and direct, matching the protagonist’s practical mindset. The novel alternates perspectives, primarily between Maggie and Jo Thibodeau, the town’s police chief. This device keeps the pacing energetic and the viewpoint dynamic, giving readers access to both the outsider expertise Maggie brings and the insider responsibilities Jo faces. 

The stylistic clarity, likely rooted in Gerritsen’s own medical background, avoids unnecessary embellishment, instead prioritizing sharp dialogue and concise scene construction. Where the prose becomes most memorable is in the banter among the Martini Club members, whose interplay provides much-needed moments of levity. Their camaraderie stands out against the often tense and suspicious mood surrounding the central mystery.

Maggie, as a protagonist, diverges from genre stereotypes. Hardened by years in espionage, she is nonetheless devoted to her community and fiercely loyal to her friends. She is stubborn, protective, and capable, caring deeply for the people around her even as she maintains her emotional distance. Jo, grappling with her own pressures as a police chief trying to assert authority in a divided community, is not merely a foil for Maggie. Instead, Jo brings her own blend of strengths and insecurities, trying to balance the meddling of retirees with the demands of local governance.

Purity Maine is vividly drawn not by lengthy explanations but through specific details: old houses, town gossip, and a collection of townspeople who oscillate between insularity and nosiness. The arrival of “summer people” complicates established dynamics, amplifying old resentments and stoking suspicion when tragedy strikes.

Gerritsen’s thematic interests go beyond resolving the central missing-person case. She examines how personal and communal histories continue to influence the present. Family secrets, the costs of loyalty, the fine line between protection and concealment—these are central concerns. The discovery of an unidentified historical corpse in a local pond complicates the main plot, surfacing long-buried associations and suspicions.

Suspicion is omnipresent, coloring interactions between year-round locals and outsiders as well as among members of the same families. Through this, the story investigates questions of trust, privacy, and the tendency in small towns for history to resurface in unexpected ways. The psychological manipulation present in these relationships is subtle but effective, as neighbors and friends often prove less than reliable.

Some readers may find the ultimate culprit or key revelations easier to anticipate than intended, as seasoned fans of the genre will recognize certain patterns. However, the core appeal lies less in shock and more in the authenticity of the characters’ motives and interactions.

Rather than constant action, Gerritsen focuses on how former intelligence operatives adapt their skillsets to civilian life, particularly when those skills are needed in unexpected ways. Humor, especially through the antics and commentary of the Martini Club, keeps the novel engaging even as the themes grow darker.

The Summer Guests is a mystery novel and a meditation on how the past continues to shape present lives, especially in a closed community. 

Though not without minor flaws in pacing or plot surprise, the book succeeds through its brisk writing, grounded characterization, and ability to balance suspense with warmth and wit. Readers interested in mysteries driven more by character and context than by relentless action will appreciate Gerritsen’s approach. 

Through Maggie and her circle, the story suggests that courage and connection endure, even (or especially) amid secrets that resist being forgotten.

4/5