Books like Mystery of the Haunted Pool by Phyllis A. Whitney

Hercule Poirot boards Le Train Bleu for a quiet trip to the Riviera, only to investigate the murder of American heiress Ruth Kettering in her luxury compartment.

A young photographer investigates a murder that seems unrelated to him, finding clues that suggest the death may have been premeditated.

Nate the Great and his loyal pup Sludge try to escape their detective routine, but a string of quirky cases pulls them back in, leading to a whacky mystery that keeps the clues—and the readers—on their toes.

Kelly Schneider, the new head lifeguard at the New Arcadia Inn, faces a deadly legend when a series of poolside accidents suggests a vengeful spirit is hunting the lifeguards.

A 16‑year‑old summer job at a luxury health club turns into a thrilling mystery when she uncovers a series of strange incidents that end in murder.

Mail order bride mystery for children in 1878 Kansas

When dogs start vanishing from a small town, the local Crimebusters team dives into a mystery that leads them to unexpected clues and a surprising encounter with Samson.

Two young detectives in Switzerland chase a dog bank robber who is actually a Professor Sardine, a clever sleuth in the style of Professor Challenger.

A young vampire hunter discovers she has supernatural abilities and must fight for survival in the dangerous world of vampires, while trying to protect her family from a cruel killer.

Alex and Ray's Vegas vacation turns into a mystery adventure with supernatural elements, featuring a young detective and a friendly Vegas character named Mack.

A teacher learns about herself while training a mentally handicapped boy to swim, confronting prejudice and deepening her own empathy.

"I very much need to be dead." These are the chilling last words left by a man who had everything to live for but took his own life. In the void that remains stands his widow, FBI agent Jane Hawk, surrounded by questions destined to go unanswered unless she does what all the grief and fury inside her demand: Find the truth, no matter what. People of talent and accomplishment, people seemingly happy and sound of mind, have recently been committing suicide in surprising numbers. A disturbing pattern is beginning to emerge. Jane is determined to give up everything to find out why. And if that means going rogue and becoming America's Most Wanted, then so be it. Those arrayed against her are legion, and devoted to protecting something profoundly important-or terrifying-enough to exterminate any and all in their way. But Jane is as clever as these enemies are cold-blooded, as relentless as they are ruthless. And she is driven by a righteous rage they can never comprehend. Because it is born of love.

When reclusive novelist Vida Winter’s health wanes, she tasks biographer Margaret Lea with revealing the truth of her life, though Margaret must sift through Winter’s penchant for exaggeration to arrive at facts.

A tale of an Englishman shipwrecked in a land of tiny people, leading to fantastical adventures and a mystery involving giants and castaways.

Squire Grizzly's maniac mansion and the ghostly Bad Bart bring the Berenstain Bears into the world of eerie mysteries.

Two detectives look for letters to help children learn the alphabet in Richard Scarry's storybook, featuring the charming characters and adventures of the Scarry family.

Mickey and Minnie uncover a secret diary that points to a hidden treasure, prompting them to investigate Clarabelle's new friend.

Since his father vanishes, Gavin Meadows probes the city’s depths and reveals a hidden, semi‑human race that has lived beneath its streets for centuries long.

A diary‑based mystery set on a college campus, where a student detective unravels intrigue among Greek letter societies, blending investigation, adventure, and suspense in a fresh juvenile fiction backdrop.