¡Una serie de misterio middle grade espeluznante, escalofriante y llena de giros góticos! Conoce a los gemelos Sinister-Winterbottom, que resuelven misterios en destinos vacacionales cada vez más extraños con la esperanza de reunirse con sus padres. o por lo menos encontrar un buen churro. Conoce a los hermanos el valiente Theo, su tímido gemelo, Alexander, y su hermana mayor, Wil. Tienen que pasar el verano con su tía Saffronia, que no sabe con qué frecuencia deben comer los niños ni es capaz de usar un teléfono inteligente, y cuyos pies nunca parecen tocar el suelo cuando se desliza. eh. camina. Cuando la tía Saffronia propone pasar una semana en un parque acuático, no dudan en aceptar. Pero el parque es aún más extraño que la tía los toboganes de agua parecen lenguas de gárgolas grises; los empleados usan vestidos negros espeluznantes y comunican mensajes siniestros; hay una figura imposible en la parte superior de la torre del tobogán, la gente está desapareciendo y una sustancia viscosa y sospechosa se está filtrando en la piscina de olas. Algo misterioso está sucediendo y depende de los gemelos llegar al fondo del asunto. Y hablamos del misterio, NO de la piscina de olas. Definitivamente NO de la piscina de olas. Pero ¿podrán Theo y Alexander escapar de sus profundidades?

The spooky summer adventures of the Sinister-Winterbottom twins continue in another gothic mystery: can Theo and Alexander solve the secret of the Sanguine Spa in the little Transylvania Mountains? After leaving Fathoms of Fun, the kids are on their way to the next odd summer destination their aunt has chosen for them. This time, they find themselves dropped off at the Sanguine Spa in the "little Transylvania Mountains". There they meet the owners: Mina, her mysterious little sister, Lucy (who is extremely pale, can't go in the sunlight, and has an affinity for hanging upside down from the ceiling), and their intimidating guardian, the Count. When the Count sends all the children in the spa on a scavenger hunt, the Sinister-Winterbottoms use the excuse to snoop around and discover that this spa may be more than just eerie—it might also hold clues to what happened to their parents. When Wil starts to show vampiric symptoms, the twins resolve to investigate what's really going on at the Sanguine Spa. The second book in the Sinister Summer series continues the adventures of the Sinister-Winterbottoms and their aunt who never saw a discount vacation destination she didn't love.

Follow the Sinister-Winterbottoms on their most outrageous adventure yet, when they find themselves at a normal summer camp! After leaving the Sanguine Spa in pursuit of Edgaren't, the kids find themselves at a mysterious summer camp, Camp Creek. There are lake games and happy counselors, and there's even a tie-dye cabin. It's all very . . . normal. But if Theo and Alexander know one thing, it's that normal doesn't always mean good. When everyone around her starts acting strange, Theo wonders if maybe the fumes from the tie-dye cabin are seeping into their brains, and she resolves to investigate what's really going on at Camp Creek.

The penultimate adventure finds the Sinister-Winterbottoms at the manor of Mr. Frank and Dr. Stein! After escaping from Edgaren’t and Dr. Jay, the Sinister-Winterbottoms and their friends arrive at Stein Manor Science Camp. They all work together to distract the friendly teenage camp director so they can explore and look for clues about where their parents might be. Meanwhile, Theo and Alexander settle on a daring plan. They know exactly where Edgaren’t is going to coming for them, and the books. This time, they’ll be ready. This time, they’ll get answers. And this time, they won’t trust the adult in charge, which is easy enough when it’s enormous, lurking, unfriendly Mr. Frank. But as they get closer to opening the books and their parents’ histories, an unexpected foe is watching everything they do... Fake volcanoes! Real sea caves! Strangely modified frogs! Startling betrayal! And a lightning-struck manor! all combine for the electrifying penultimate Sinister Summer adventure.

Giant battle robots! Cotton candy betrayal! Blasts from the past! And the ultimate challenge to stay true to themselves and each other await Theo and Alexander in the final book in the tragic series about the Sinister-Winterbottom twins, who must solve one wretched mystery after the next. Trapped in Aunt Saffronia’s spectral house, Theo and Alexander must work together to escape, stop their newfound nemesis Essa and her henchman Edgaren’t, save Wil and their friends, find their parents, and maybe, just maybe, get things back to normal. Following the clues left behind, the twins find themselves at Siren’s Song Seaside Amusement Park. Old faces and new surprises await them in a park that was built to lure in visitors… and their secrets. As they get closer to answers, the twins are left with the biggest question of Who is Essa really, and why is she so determined to find their parents?